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Nolan M, Morgan L, Curran M, Clayton J, Gerrish K, Parker K. Evidence-based care: can we overcome the barriers? BRITISH JOURNAL OF NURSING (MARK ALLEN PUBLISHING) 1998; 7:1273-8. [PMID: 9934035 DOI: 10.12968/bjon.1998.7.20.5567] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Evidence-based care has become the new mantra within the NHS, despite the fact that the concept of applying research to practice has been promoted for several decades. However, literature on the subject suggests that formidable obstacles remain to the integration of research into care delivery. This article describes a study which used Funk et al's (1991a,b) Barriers Scale with a population of nurses in a large teaching hospital in the UK. This scale was specifically developed to identify barriers to the introduction of research into practice, and modified for a UK context. The results suggest that a complex array of barriers exist but that foremost among these is the nature of the organizations within which nurses work. Comparisons are made with data from the USA, and the need to create time for nurses to implement change, and to empower them to do so, is stressed.
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Crubézy E, Ludes B, Poveda JD, Clayton J, Crouau-Roy B, Montagnon D. Identification of Mycobacterium DNA in an Egyptian Pott's disease of 5,400 years old. COMPTES RENDUS DE L'ACADEMIE DES SCIENCES. SERIE III, SCIENCES DE LA VIE 1998; 321:941-51. [PMID: 9879471 DOI: 10.1016/s0764-4469(99)80009-2] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The antiquity of tuberculosis in the Old World is controversial because the morphology of the lesion in skeletal remains is non-specific. We report the recovery of a DNA fragment from a 5,400-year-old Predynastic Egyptian skeleton that exhibits a kyphotic, 'hunchback' spinal deformity consistent with Pott's disease and suggestive of tuberculous vertebral involvement. The recovered DNA fragment was sequenced and is consistent with an original Mycobacterium sequence. We cannot prove that it is M. tuberculosis, M. bovis or an ancient mycobacteria resembling the two current forms because the observed modifications in the sequence could be attributed to the antiquity of Mycobacterium and/or to the effects of Taq polymerase. This provides the most specific evidence for the antiquity of human Mycobacterium disease in the world.
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Clayton J, Smith K, Qureshi H, Ferguson B. Collecting patients' views and perceptions of continence services: the development of research instruments. J Adv Nurs 1998; 28:353-61. [PMID: 9725733 DOI: 10.1046/j.1365-2648.1998.00689.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This paper describes one part of a feasibility study carried out in England which examined the costs, quality and effectiveness of continence services in areas with different approaches to provision. It involved the design of instruments to collect the views and perceptions of patients and an investigation of ways to develop a methodology to implement comparative studies. It is the design and piloting of the questionnaires and the way patients responded that forms the focus of this paper. The main sample group recruited for the study were women who had recently sought formal help with urinary incontinence and were likely to receive conservative treatment or management in the community. They were interviewed and asked to complete four questionnaires at two points in time. A smaller sub-group of disabled women, interviewed only once, were included to compare cost profiles for different client groups. The questionnaires which were developed address the impact of urinary incontinence (using a standard scale), the effectiveness of service provision in terms of patients' clinical history, expectations and hoped-for outcomes, service receipt and its cost, and patients' satisfaction with several aspects of service provision. In total 118 women were interviewed, including 28 disabled women. The study generated a set of survey instruments which might be used for a variety of purposes including audit and future research and which could inform purchaser and provider decisions by using patients' perspectives of quality of life outcomes to enhance service development.
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Ruston A, Clayton J, Calnan M. Patients' action during their cardiac event: qualitative study exploring differences and modifiable factors. BMJ (CLINICAL RESEARCH ED.) 1998; 316:1060-4. [PMID: 9552909 PMCID: PMC28510 DOI: 10.1136/bmj.316.7137.1060] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES To explore the circumstances and factors that explain variations in response to a cardiac event and to identify potentially modifiable factors. DESIGN Qualitative analysis of semistructured, face to face interviews with patients admitted to two district hospitals for a cardiac event and with other people present at the time of the event. Patients were divided into three groups according to the length of delay between onset of symptoms and calling for medical help. SUBJECTS 43 patients and 21 other people present at the time of the cardiac event. Patients were divided into three groups according to the length of time between onset of symptoms and seeking medical help: non-delayers (< 4 h; n = 21), delayers (4-12 h; n = 12), and extended delayers (> 12 h; n = 10). MAIN OUTCOME MEASURES Decision making process, strategies for dealing with symptoms, and perception of risk and of heart attacks before the event according to delay in seeking help. RESULTS The illness and help seeking behaviour of informants had several components, including warning, interpretation, preliminary action, re-evaluation, and final action stages. The length of each stage was variable and depended on the extent to which informants mobilised and integrated resources into a strategy to bring their symptoms under control. There were obvious differences in informants' knowledge of the symptoms that they associated with a heart attack before the event. Non-delayers described a wider range of symptoms before their heart attack and twice as many (13) considered themselves to be potentially at risk of a heart attack compared with the other two groups. For most informants the heart attack differed considerably from their concept of a heart attack. CONCLUSION The most critical factor influencing the time between onset of symptoms and calling for professional medical help is that patients and others recognise their symptoms as cardiac in origin. This study suggests that various points of intervention in the decision making process could assist symptom recognition and therefore faster access to effective treatment.
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Christophers J, Clayton J, Craske J, Ward R, Collins P, Trowbridge M, Darby G. Survey of resistance of herpes simplex virus to acyclovir in northwest England. Antimicrob Agents Chemother 1998; 42:868-72. [PMID: 9559798 PMCID: PMC105557 DOI: 10.1128/aac.42.4.868] [Citation(s) in RCA: 155] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Acyclovir (ACV) has been used for more than 15 years in the management of herpes simplex virus (HSV) and varicella-zoster virus (VZV) disease. The present survey was undertaken to assess the level of ACV resistance in the population. More than 2,000 HSV isolates from both immunocompetent and immunocompromised patients in northwest England were collected over a 2-year period and tested for sensitivity to ACV. These studies suggested a prevalence of resistance of approximately 0.1 to 0.6% in immunocompetent individuals, with no apparent difference in prevalence between treated and untreated groups. In line with previous studies, the prevalence of resistance in treated immunocompromised individuals was approximately 6%.
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Parker K, Morgan L, Clayton J, Gerrish K, Nolan M. Pressure damage prevention: basing practice on evidence. Nurs Stand 1998; 12:39-41. [PMID: 9732647 DOI: 10.7748/ns.12.25.39.s48] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
As part of an initiative to develop evidence-based practice at the Northern General Hospital, Sheffield, a three-part project was undertaken. The aims were to identify barriers to using research in nursing, establish a baseline of nurses' knowledge and its influence on their practice in one essential area of nursing care--pressure damage prevention--and develop a strategy for change which took account of the findings from the first two parts of the project. In this article, the authors describe the second part of the project which examined nursing knowledge and practice with reference to the management of pressure damage prevention. The findings are discussed and the authors recommend that nurses integrate into their practice evidence from sources such as systematic reviews.
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Gerrish K, Clayton J. Improving clinical effectiveness through an evidence-based approach: meeting the challenge for nursing in the United Kingdom. Nurs Adm Q 1998; 22:55-65. [PMID: 9727143 DOI: 10.1097/00006216-199802240-00022] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Improving clinical effectiveness is a major challenge facing nurses working in the United Kingdom and requires a coordinated approach in order to ensure that the information about which interventions work is made available to those in a position to use it. This means that policy makers, administrators, and nurses need to base decision making on the best available evidence. In this article we explore the background to the drive for evidence-based practice and discuss how a group of nurse researchers have begun working with nurse administrators and practitioners in a large acute hospital to help change the rhetoric of evidence-based practice in nursing into reality.
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MacKenzie J, Clayton J. Cellular reactions in the penumbra of human spontaneous intracerebral haemorrhage. J Stroke Cerebrovasc Dis 1997. [DOI: 10.1016/s1052-3057(97)80190-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Kovalerchuk B, Triantaphyllou E, Ruiz JF, Clayton J. Fuzzy logic in computer-aided breast cancer diagnosis: analysis of lobulation. Artif Intell Med 1997; 11:75-85. [PMID: 9267592 DOI: 10.1016/s0933-3657(97)00021-3] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This paper illustrates how a fuzzy logic approach can be used to formalize terms in the American College of Radiology (ACR) Breast Imaging Lexicon. In current practice, radiologists make a relatively subjective determination for many terms from the lexicon related to breast cancer diagnosis. Lobulation and microlobulation of nodules are two important features in the ACR lexicon. We offer an approach for formalizing the distinction of these features and also formalize the description of intermediate cases between lobulated and microlobulated masses. In this paper it is shown that fuzzy logic can be an effective tool in dealing with this kind of problem. The proposed formalization creates a basis for the next three steps (i) extended verification with blinded comparison studies. (ii) the automatic extraction of the related primitives from the image, and (iii) the detection of lobulated and microlobulated masses based on these primitives.
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Ashman K, Houthaeve T, Clayton J, Wilm M, Podtelejnikov A, Jensen ON, Mann M. The application of robotics and mass spectrometry to the characterisation of theDrosophila melanogaster indirect flight muscle proteome. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/bf02443516] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Grimaldi MC, Clayton J, Pontarotti P, Cambon-Thomsen A, Crouau-Roy B. New highly polymorphic microsatellite marker in linkage disequilibrium with HLA-B. Hum Immunol 1996; 51:89-94. [PMID: 8960910 DOI: 10.1016/s0198-8859(96)00228-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The difficulty of molecular typing of the HLA class I genes and the relevance of the genes of this region to disease susceptibility and transplantation have provided an impetus to develop useful typing markers. We have characterized by polymerase chain reaction analysis a new highly informative CA repeat localized approximately 25-kb centromeric to the gene HLA-B and 10-kb telomeric to the gene MICA. Twelve alleles defined by length were found in a sample of French Basques, with the PIC being 0.82. A detailed haplotype analysis was performed to investigate the association between this microsatellite and two others markers of the region (HLA-B gene and TNF region microsatellite). The 10 haplotypes with the highest estimated frequencies show evidence of a gametic association or linkage disequilibrium. A very strong association between the expressed HLA-B polymorphism and microsatellite alleles was also revealed in this sample and confirmed in the workshop cells lines of the Fourth Asia-Oceania Histocompatibility Workshop. This marker can be used in the fine mapping of this region and the association with some alleles of HLA-B may allow the replacement of HLA-B typing at least in a preliminary study. Moreover, these studies support the hypothesis of a high mutability for large alleles in microsatellite loci.
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Bouguerra F, Dugoujon J, Clayton J, Babron M, Debbabi A, Khaldi F, Bennaceur B, Clerget-Darpoux F. Les marqueurs Gm et Km des immunoglobulines dans la maladie cæliaque. Arch Pediatr 1996. [DOI: 10.1016/s0929-693x(96)89569-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abbas F, Clayton J, Marshall K, Senior J. A preliminary study of prostaglandin release by bradykinin (BK) on isolated human myometrium. IMMUNOPHARMACOLOGY 1996; 33:130-2. [PMID: 8856131 DOI: 10.1016/0162-3109(96)00028-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The aim of this study was to investigate whether the response to BK on isolated human myometrium from non-pregnant (NP) and pregnant (P) donors involves the release of prostaglandin I2 (PGI2) and/or of PGE2. BK was injected as a bolus dose into the flow of the superfusate. The perfusate was collected during a response to BK and PG concentration measured by enzymoimmunoassay for PGE2 or PGI2. The BK response was biphasic, consisting of contraction followed by inhibition of myogenic activity. In tissues from both NP and P donors BK was found to cause a dose related release of PGE2 and PGI2. BK evoked PGE2 release which was greater during the contractile response than in the inhibitory response. Following the same dose of BK, PGI2 release was found to be greater in the inhibitory response than in the contractile phase. The findings indicate that in isolated human myometrium the response to BK does involve the release of PGE2 and PGI2 and in both NP and P tissue PGE2 release is greater in the contractile response phase whilst PGI2 predominates the inhibitory phase.
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Abbas F, Clayton J, Marshall K, Senior J. Investigation into the role of cyclooxygenase products in the bradykinin response on isolated human myometrium and umbilical artery. IMMUNOPHARMACOLOGY 1996; 33:123-6. [PMID: 8856129 DOI: 10.1016/0162-3109(96)00026-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The aim of this study was to investigate the response to bradykinin (BK) on human myometrium and umbilical artery with respect to cyclo-oxygenase (CO) products. Dose/concentration response curves to BK were performed +/-2.79 microM indomethacin. On human myometrium the response to BK (0.001-50 nmol) was biphasic and consisted of a dose-related increase in myometrial tension which was followed by a period of inhibition of myogenic activity. In tissues from P donors the presence of indomethacin had no significant effect on the excitatory response, but the inhibitory component of the response was reduced. In tissues from NP donors indomethacin significantly enhanced the BK effect at higher doses and the inhibitory component of the response was reduced. On the HUA cumulative addition of BK (1-1000 nM) resulted in dose dependent constriction with desensitisation at the highest dose (EC50 = 38 nM). The presence of indomethacin had no significant effect on BK response on HUA. These findings suggest that CO products contribute significantly to response to BK on the human myometrium but not on HUA and that different CO products are produced by P and NP tissue.
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65
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Abbas F, Clayton J, Marshall K, Scott H, Senior J. Comparison of the effects of bradykinin and related compounds on isolated mouse and human uterus. IMMUNOPHARMACOLOGY 1996; 33:127-9. [PMID: 8856130 DOI: 10.1016/0162-3109(96)00027-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The purpose of this study was to investigate and compare the response of the isolated human myometrium (non-pregnant donors) and mouse uterus to bradykinin (BK), Lys-BK and des-Arg9-BK (+/-2.79 microM indomethacin). The uterine strips were set up for superfusion using Kerbs' solution. On the human myometrium the responses to BK and Lys-BK were biphasic and consisted of an increase in myometrial tension which was followed by a period of inhibition of myogenic activity. Des-Arg9-BK evoked a monophasic contractile response. On the mouse uterus the responses to BK, Lys-BK and des-Arg9-BK were monophasic and contractile only. On both of the tissues the contractile responses to BK and Lys-BK were bell shaped and indomethacin abolished the bell-shaped part of the dose response curves. The response to des-Arg9-BK and the inhibitory response to BK and Lys-BK, on the human tissue, was also significantly reduced in the presence of indomethacin. The results of this study suggest that the human and mouse uterus do posses kinin receptors of the B2 type but on human myometrium these are biphasic responses.
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Dorothy R, Carcassi C, de Solages H, Abbal M, Crouau-Roy B, Clayton J, Cambon-Thomsen A, Contu L. MHC haplotypes including eight microsatellites in French Basques and in Sardinians. Hum Immunol 1996. [DOI: 10.1016/0198-8859(96)84961-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Crouau-Roy B, Bouzekri N, Carcassi C, Clayton J, Contu L, Cambon-Thomsen A. Strong association between microsatellites and an HLA-B, DR haplotype (B18-DR3): implication for microsatellite evolution. Immunogenetics 1996; 43:255-60. [PMID: 9110928 DOI: 10.1007/bf02440992] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The HLA haplotype B18-DR3 has a widespread geographical distribution, but has its greatest frequencies in Southern Europe, probably vestigial of the earliest populations of this region, particularly in the Pays Basque and Sardinia. This haplotype is of medical significance, being that most implicated as a factor of risk in insulin-dependent diabetes mellitus. In this study, the closely linked microsatellite markers (TNFa,b,c) in the region of the tumor necrosis factor (TNF) genes have been used in an attempt to subtype this haplotype in the two populations and/or in healthy and diabetic populations. A total of 79 HLA-B18-DR3 haplotypes were analyzed: 54 in Basques (12 from healthy individuals and 42 from diabetics or their first-degree relatives) and 25 in Sardinians (13 from healthy and 12 from diabetic individuals). The TNF haplotype a1-b5-c2 is completely associated with B18-DR3 in both populations. The homogeneity of the B18-DR3 haplotype in two ethnically pure populations implies stability in evolution, which suggests that the mutation rate of these microsatellite markers must be less than is usually assumed (i. e., approximately 5 x 10(-4) per site per generation). Such markers should be powerful tools for studying genetic drift and admixture of populations, but it remains to be established whether this stability is a rule for all microsatellites in HLA haplotypes or whether it is restricted to some microsatellites and/or some HLA haplotypes. The population genetics of those microsatellites associated with HLA B18-DR3 was also studied in a random sample of the Basque population.
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O'coigligh S, Clayton J, Williams RM, Menai-Williams R. Osseous metaplasia of the endometrium: Two case reports. J OBSTET GYNAECOL 1996. [DOI: 10.3109/01443619609004105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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69
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Lonjou C, Clayton J, Cambon-Thomsen A, Raffoux C. HLA -A, -B, -DR haplotype frequencies in France--implications for recruitment of potential bone marrow donors. Transplantation 1995; 60:375-83. [PMID: 7652768 DOI: 10.1097/00007890-199508270-00013] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We have undertaken a study of the haplotypes among French potential bone marrow donors in order to define the geographical regions of France with the maximum of polymorphism and also to develop a strategy for optimal donor recruitment. A maximum likelihood estimator was used to calculate haplotype frequencies and their support limits for each region and for the whole of France. The observed differences between the regions were statistically significant. For each region, the minimum number of haplotypes necessary to explain 50% of the total frequency was calculated and compared with the equivalent values, and confidence intervals, obtained by repeated random samplings from the overall file. This approach shows that some regions (e.g., Provence) appear to be richer in terms of the numbers of haplotypes observed, and others (e.g., Bretagne) poorer. In the latter case, however, the frequencies of the most common haplotypes are greater. The haplotype frequencies of the whole sample were used to calculate the probability of finding a match for the next potential recipient for given sizes of the donor file, assuming random selection of donors. They were also used to calculate expected numbers of the major phenotypes, assuming Hardy-Weinberg equilibrium, and these were compared with those observed in the real data file. In this way, a large number of under-represented and nonrepresented phenotypes were identified. For each of these phenotypes, the most probable haplotypes and the regions in which these have the greatest frequencies have been identified. A search for donors with such particular phenotypes would be much more fruitful if directed towards these regions.
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Abstract
Ultrasound examination of the ovaries was performed in the first and/or second half of three consecutive cycles in 3 groups of women; Group T who had been using a levonorgestrel triphasic oral contraceptive for at least 6 months, Group P who had been using a progestogen-only pill for at least 6 months, and Group C, a control group. Any follicles greater than 10 mm in diameter and any cysts were measured. Fifty-three scans were performed in Group T, 45 in Group P and 31 in Group C. Only 4 follicles were detected in 17 women in Group T compared to 10 follicles in 15 women in Group P and 7 follicles in the women in Group C; all follicles were 25 mm or less in diameter except for 3 follicles in 2 women. The differences between the groups were not statistically significant. Four enlarged follicles were detected in 3 women during 53 scans in Group T, 15 in 8 women (45 scans) in Group P, and only 1 in 31 scans in Group C. Based upon the proportions of scans with enlarged follicles, the difference between Groups T and P was statistically significant, indicating that the incidence of enlarged follicles was lower in women using a combined oral contraceptive than in those using a progestogen-only pill. Furthermore, the study shows that any enlarged follicles which occurred were transient.
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MESH Headings
- Adult
- Contraceptive Agents, Female/adverse effects
- Contraceptive Agents, Female/pharmacology
- Contraceptives, Oral/adverse effects
- Contraceptives, Oral/pharmacology
- Contraceptives, Oral, Combined/adverse effects
- Contraceptives, Oral, Combined/pharmacology
- Contraceptives, Oral, Synthetic/adverse effects
- Contraceptives, Oral, Synthetic/pharmacology
- Estradiol Congeners/adverse effects
- Estradiol Congeners/pharmacology
- Ethinyl Estradiol/adverse effects
- Ethinyl Estradiol/pharmacology
- Female
- Humans
- Levonorgestrel/adverse effects
- Levonorgestrel/pharmacology
- Middle Aged
- Norethindrone/adverse effects
- Norethindrone/pharmacology
- Ovarian Follicle/diagnostic imaging
- Ovarian Follicle/drug effects
- Ovarian Follicle/pathology
- Ovary/diagnostic imaging
- Ovary/drug effects
- Ovary/pathology
- Progestins/adverse effects
- Progestins/pharmacology
- Ultrasonography
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Crouau-Roy B, Clayton J. Haplotypes without children: PCR applied to close loci on individual human sperm. Hum Biol 1995; 67:171-8. [PMID: 7721277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Indirect evidence of interindividual variation of the recombination fraction is considerable, but as yet direct evidence is lacking. Such interindividual variation could explain the widely observed gametic association in the major histocompatibility complex (MHC) region. A possible approach to this is the application of the polymerase chain reaction to closely linked markers on individual sperm. The feasibility of this approach is investigated here. Three loci in the human MHC (chromosome 6) were used in this study. Two are polymorphisms identifiable by oligonucleotide dot blotting, and one is a microsatellite polymorphism. The genetic distances between these loci are 0.5 and 1 centi-Morgan. We were able to double-type most cases for the two markers HLA-DPB and HLA-DRB in single haploid cells. The rate of double typings is comparable with that expected from the hypothesis of independent failures at two loci. However, this rate of failure remains too great to allow an analysis of segregation because allele specific failure cannot be ruled out. All double and triple typings (implicating the microsatellite) were perfectly correlated with each other; thus no recombinations were identified. With such close markers recombination would have been surprising and may indicate an inherent accuracy of positive haplotyping.
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Sheterline P, Clayton J, Sparrow J. Actin. PROTEIN PROFILE 1995; 2:1-103. [PMID: 8548558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Salvignol I, Blancher A, Calvas P, Clayton J, Socha WW, Colin Y, Ruffié J. Molecular genetics of chimpanzee Rh-related genes: their relationship with the R-C-E-F blood group system, the chimpanzee counterpart of the human rhesus system. Biochem Genet 1994; 32:201-21. [PMID: 7993375 DOI: 10.1007/bf00554623] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
As the chimpanzee R-C-E-F blood group system appears to be the chimpanzee counterpart of the human Rhesus (RH) system, we have tried to determine whether chimpanzee Rh-like genes encode R-C-E-F-related proteins. Chimpanzee genomic DNA, digested by any of eight endonucleases and hybridized with three Rh exon-specific probes, exhibits a high degree of polymorphism. Analysis of DNA from unrelated individuals of different R-C-E-F types revealed that the presence of some restriction fragments is correlated with particular R-C-E-F types. The cosegregation of these fragments with R-C-E-F haplotypes was confirmed by family studies. Oligonucleotides complementary to regions flanking human exons were used as PCR primers on chimpanzee DNA; the resulting amplified fragments were identical in size to their human counterparts. Moreover, the nucleotide sequences of the fragments present a high degree of similarity to the corresponding human regions.
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Crouau-Roy B, Amadou C, Bouissou C, Clayton J, Vernet C, Ribouchon MT, Pontarotti P. Localization of the OTF3 gene within the human MHC class I region by physical and meiotic mapping. Genomics 1994; 21:241-3. [PMID: 8088794 DOI: 10.1006/geno.1994.1249] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OTF3 (octamer transcription factor 3) is a transcription factor containing a POU-specific domain and a homeodomain that could play a role in early development. In situ hybridization and pairwise linkage analysis showed that OTF3 gene maps close to the human MHC (major histocompatibility complex). In this paper, we define its localization within the MHC, around 100 kb telomeric to HLA-C, using a combination of physical and genetic analyses.
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Roth MP, Nogueira L, Coppin H, Clanet M, Clayton J, Cambon-Thomsen A. Tumor necrosis factor polymorphism in multiple sclerosis: no additional association independent of HLA. J Neuroimmunol 1994; 51:93-9. [PMID: 8157738 DOI: 10.1016/0165-5728(94)90133-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In order to investigate whether genes coding for tumor necrosis factors (TNF) contribute to the pathogenesis of multiple sclerosis (MS) and also whether they have a non-random association with the MS associated HLA-DRB1*1501-DQA1*0102-DQB1*0602 haplotype, 40 MS patients and their parents were characterized at four polymorphic loci in the region of the TNF genes: a NcoI RFLP and three microsatellites. We were able to determine the parental haplotypes and used those which were not transmitted to the proband as controls. Fifty percent of the HLA-DRB1*1501-DQA1*0102-DQB1*0602 haplotypes carried the TNFc1-n2-a11-b4 allelic combination in both the patient and the control groups. However, there was no association of any of these TNF polymorphisms with MS, independent of that already described for the class II region. This, with the lack of association of DP alleles with MS, effectively marks the boundaries of the MS associated haplotype.
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Roth MP, Riond J, Champagne E, Essaket S, Cambon-Thomsen A, Clayton J, Clanet M, Coppin H. TCRB-V gene usage in monozygotic twins discordant for multiple sclerosis. Immunogenetics 1994; 39:281-5. [PMID: 8119736 DOI: 10.1007/bf00188792] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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78
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Lonjou C, Clayton J, Cambon-Thomsen A, Raffaoux C. HLA -A, -B, -DR haplotype frequencies in France: Implications for lists of potential bone marrow donnors. Hum Immunol 1994. [DOI: 10.1016/0198-8859(94)90126-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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79
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Roth MP, Clayton J, Patois E, Alperovitch A. Gender distributions in parents and children concordant for multiple sclerosis. Neuroepidemiology 1994; 13:211-5. [PMID: 7969704 DOI: 10.1159/000110381] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The family histories of 7,802 multiple sclerosis (MS) patients were reviewed with respect to the familial pattern of the disease and the gender of the affected individuals. These patients joined an epidemiological study following a call for patients on French television and answered a questionnaire with the help of their physician. 170 had an affected parent, providing 72 mother-daughter pairs, 48 mother-son pairs, 37 father-daughter pairs, and 13 father-son pairs. From these data, the maximum likelihood estimate of the female to male ratio is 2.06, which is not different from what could be expected given the ratio of 2:1 usually found among patients. The apparent deficit of father-son concordant pairs probably simply reflects the well-known preponderance of the disease among females.
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Crouau-Roy B, Briant L, Bouissou C, Stravropoulos C, Pociot F, Cambon-Thomsen A, Clayton J. Tumor necrosis factor microsatellites in four European populations. Hum Immunol 1993; 38:213-6. [PMID: 8106279 DOI: 10.1016/0198-8859(93)90543-a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The human genome contains a large number of interspersed simple repeat sequences that vary in length among individuals and can therefore serve as highly informative polymorphic markers. Several such variable sites (microsatellites) have been described within the TNF genes within the MHC. In this study, individuals from four Caucasian populations have been typed for three TNF-associated microsatellites in order to define their haplotypes. Of the 208 possible haplotypes, eight exist at a high frequency in all populations and account for approximately 60% of the haplotypes studied, but with marked variations in their frequencies among populations. A few population/sample-specific haplotypes have been identified. The ability of alleles to define haplotypes uniquely varies not only among the loci, but also among the alleles: some alleles displaying complete gametic association (linkage disequilibrium) and others displaying very little.
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81
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Hudson JL, van Horne CG, Strömberg I, Brock S, Clayton J, Masserano J, Hoffer BJ, Gerhardt GA. Correlation of apomorphine- and amphetamine-induced turning with nigrostriatal dopamine content in unilateral 6-hydroxydopamine lesioned rats. Brain Res 1993; 626:167-74. [PMID: 8281427 DOI: 10.1016/0006-8993(93)90576-9] [Citation(s) in RCA: 299] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In the unilateral 6-hydroxydopamine (6-OHDA)-lesioned rat model of Parkinson's disease, controversy exists concerning the use of apomorphine- or D-amphetamine-induced rotations as reliable indicators of nigrostriatal dopamine depletion. Our objective was to evaluate which, if either, drug-induced behavior is more predictive of the extent of nigrostriatal dopamine depletion. Fischer 344 and Sprague-Dawley rats were unilaterally injected with 9 micrograms/4 microliters/4 min 6-hydroxydopamine into the medial forebrain bundle. The animals were behaviorally tested with apomorphine (0.05 mg/kg, s.c.) and D-amphetamine (5.0 mg/kg, s.c.). Following testing, the brains were removed and the right and left striata, substantia nigra and ventral tegmental area were dissected free and quickly frozen at -70 degrees C for analysis of catecholamine content by high performance liquid chromatography coupled with electrochemical detection. Our results indicate that an animal which has greater than a 90% depletion of dopamine in the striatum might not rotate substantially on apomorphine, without a concomitant depletion of > 50% of the DA content in the corresponding substantia nigra. No correlations were seen involving depletions of the ventral tegmental area and the extent of the lesions to the striatum. Submaximally lesioned (75-90% depleted) rats were found to rotate on D-amphetamine but not on apomorphine. In addition, control rats that did not receive lesions were often seen to rotate extensively on D-amphetamine. We therefore conclude that maximal lesions of the striatum and substantia nigra are required to generate rotations demonstrable with low dose apomorphine but not with D-amphetamine.(ABSTRACT TRUNCATED AT 250 WORDS)
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Clayton J. MRC research centre under threat from London health service plans. Nature 1993; 365:477. [PMID: 8413594 DOI: 10.1038/365477a0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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83
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Clayton J, Keil O. Managing mercury: viewpoints from inside the hospital. MEDICAL WASTE ANALYST 1993; 2:6-7. [PMID: 10132647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Clayton J, Senior J, Marshall K. Drugs for preterm labour. THE PRACTITIONER 1993; 237:582-4. [PMID: 8415391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Luke SJ, Vandenbosch R, Benenson W, Clayton J, Joh K, Krofcheck D, Murakami TK, Stevenson JD. High energy gamma rays from 14N+natAg at 35 MeV/nucleon. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1993; 47:1211-1218. [PMID: 9968553 DOI: 10.1103/physrevc.47.1211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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88
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Blancher A, Clayton J, Socha WW, Ruffié J. Application of maximum likelihood statistics for the population and family studies of inheritance of the chimpanzee R-C-E-F and V-A-B-D blood groups. J Med Primatol 1993; 22:44-9. [PMID: 8411098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Maximum likelihood statistics were applied to the analysis of serological data to confirm the originally proposed genetic models of the chimpanzee R-C-E-F and V-A-B-D systems. Five hundred ninety-nine chimpanzees, including 81 parents of 114 offspring, were tested for R-C-E-F, and 60 parents of 80 offspring were tested for V-A-B-D blood groups. An estimation-maximization procedure was used to obtain maximum likelihood estimates and support intervals of the haplotype frequencies. For each haplotype, the null hypothesis of nonexistence was evaluated. The frequencies obtained by this method do not differ significantly from those calculated by the square root formula, but put these estimates on a statistically more rigorous footing.
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Blancher A, Clayton J, Socha W, Ruffié J. Application of maximum likelihood statistics for the population and family studies of inheritance of the chimpanzee R‐C‐E‐F and V‐A‐B‐D blood groups. J Med Primatol 1993. [DOI: 10.1111/j.1600-0684.1993.tb00635.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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90
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Crouau-Roy B, Clayton J, Pociot C, Stravopoulos A, Cambon-Thomsen A. TNF microsatellites in european populations. Hum Immunol 1993. [DOI: 10.1016/0198-8859(93)90023-t] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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91
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Briant L, Avoustin P, Clayton J, McDermott M, Clanet M, Cambon-Thomsen A. Multiple sclerosis susceptibility: population and twin study of polymorphisms in the T-cell receptor beta and gamma genes region. French Group on Multiple Sclerosis. Autoimmunity 1993; 15:67-73. [PMID: 8105988 DOI: 10.3109/08916939309004841] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Multiple sclerosis (MS) is a demyelinating auto-immune disease of the central nervous system with a suspected genetic component. Previous publications have demonstrated that MS susceptibility is influenced by Major Histocompatibility Complex (MHC) genes and recent studies have focused on additional susceptibility genes. The accumulation of activated T-cells in demyelinating MS lesions, the possible auto-immune mechanism of this disease and the functional relationship between MHC and T cell receptor (TCR) molecules support the hypothesis that TCR genes are good candidates to influence MS development. Published results in this domain are conflicting and still a matter of controversy. In the present study we analysed the influence of V beta, C beta, P lambda G3 and V gamma gene polymorphisms defined by Restriction Fragments Length Polymorphism (RFLP) on 48 pairs of monozygotic and dizygotic twins with at least one of each pair affected, and also in 63 unrelated MS patients for V gamma gene polymorphism. These results have been compared with those in the non affected twins and with data from a control group (Beall et al., 1989) regarding C beta and V beta polymorphisms and with a local control population for V gamma. No significant correlation between C beta, V gamma or P lambda G3 polymorphisms and MS was found, only a non significant tendency to reduced P lambda G3 allele sharing among dizygotic non concordant twin pairs was observed. However one V beta 11, 25 kb allele and a haplotype defined by V beta 11 and C beta alleles showed a correlation with MS susceptibility of borderline significance.(ABSTRACT TRUNCATED AT 250 WORDS)
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Constans J, Ribouchon MT, Gouaillard C, Chaventré A, Clayton J. A new polymorphism of thyroxin-binding globulin in three African groups (Mali) with endemic nodular goitre. Hum Genet 1992; 89:199-203. [PMID: 1587531 DOI: 10.1007/bf00217123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The thyroxin-binding globulin (TBG) polymorphism was investigated in three African groups: two belonged to the Bwa villages of Mali, and the third was a Dogon group living in the same area. The Bwa groups were characterized by the occurrence of nodular goitres, whereas the Dogon population did not show similar pathological symptoms. Females were more affected by goitre than males in the affected villages. The TBG polymorphism enabled us to demonstrate the presence of an undescribed allele (TBG C1) in these populations. The frequency of the TBG S allele was also higher than previously published in other African groups. We observed a disequilibrium in the distribution of the C and S alleles in the population, with an excess of homozygous TBG S individuals. No clear relationship between the TBG polymorphism and the number of nodules can be drawn.
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93
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Boretto J, Jouanolle AM, Yaouanq J, el Kahloun A, Mauvieux V, Blayau M, Perichon M, Le Treut A, Clayton J, Borot N. Anonymous markers located on chromosome 6 in the HLA-A class I region: allelic distribution in genetic haemochromatosis. Hum Genet 1992; 89:33-6. [PMID: 1349563 DOI: 10.1007/bf00207038] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two yeast artificial chromosomes of the HLA class I region were subcloned. Four of the subclones studied displayed restriction polymorphisms that corresponded to six bi-allelic series. Allelic distribution of the anonymous markers was then studied by comparing a control population with a group of patients with familial haemochromatosis. Only one marker presents an unequivocal association with the haemochromatosis gene and is 100 kb centromeric to HLA-A. This association however is not as strong as with HLA-A3. The results suggest two possible locations for the haemochromatosis gene: less than 100 kb centromeric to the HLA-A locus, or on the telomeric side.
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Clayton J, Benenson W, Cronqvist M, Fox R, Krofcheck D, Pfaff R, Reposeur T, Stevenson JD, Winfield JS, Young B, Mohar MF, Bloch C, Fields DE. High energy gamma ray production in proton-induced reactions at 104, 145, and 195 MeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1992; 45:1815-1821. [PMID: 9967935 DOI: 10.1103/physrevc.45.1815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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95
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Clayton J, Benenson W, Cronqvist M, Fox R, Krofcheck D, Pfaff R, Reposeur T, Stevenson JD, Winfield JS, Young B, Mohar MF, Bloch C, Fields DE. Proton-deuteron bremsstrahlung at 145 and 195 MeV. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1992; 45:1810-1814. [PMID: 9967934 DOI: 10.1103/physrevc.45.1810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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96
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Merrill JE, Kono DH, Clayton J, Ando DG, Hinton DR, Hofman FM. Inflammatory leukocytes and cytokines in the peptide-induced disease of experimental allergic encephalomyelitis in SJL and B10.PL mice. Proc Natl Acad Sci U S A 1992; 89:574-8. [PMID: 1370583 PMCID: PMC48281 DOI: 10.1073/pnas.89.2.574] [Citation(s) in RCA: 198] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Experimental allergic encephalomyelitis (EAE) was generated in SJL and B10.PL mice by using the synthetic myelin basic protein peptides. Inflammation in brain and spinal cord preceded clinical signs of disease. Infiltrating lymphocytes were predominantly Lyt1+ (CD5+), L3T4+ (CD4+) T cells, until day 18. After that, F4/80+ monocyte/macrophages outnumbered T cells. Ia+ cells were microglia, macrophages, and endothelial cells, but Ia was not detectable on astrocytes in this EAE model. Ia+ endothelial cells appeared later in the disease than Ia+ microglia and macrophages, suggesting that antigen presentation at the blood-brain barrier is not initially responsible for inflammation. Cells staining for interferon gamma, interleukin 2 (IL-2), and IL-2 receptors were more prominent than IL-4, IL-5, lymphotoxin (LT), and tumor necrosis factor alpha (TNF-alpha), which occurred transiently in the second week and were associated with fewer cells. TNF-alpha and LT were never seen in spinal cord, suggesting that these cytokines are not responsible for initiation of clinical disease. Few or no cells stained for IL-6, IL-1, or transforming growth factor beta. Control animals injected with complete Freund's adjuvant in saline or control antigen demonstrated no inflammatory cell infiltration or cytokine production. Thus, our findings suggest a peptide-induced EAE model in which Th1 T-cell-macrophage interactions result in the disease process.
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Thomsen JR, Clayton J, Baker R, Nowlin J. Neonatal respiratory distress secondary to an obstructing nasopharyngeal dermoid. Clin Pediatr (Phila) 1992; 31:44-7. [PMID: 1737420 DOI: 10.1177/000992289203100109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A case presentation of a newborn infant with intermittent, complete airway obstruction secondary to a pedunculated nasopharyngeal dermoid is presented. The differential diagnosis of obstructing nasopharyngeal lesions of the neonatal period is discussed, and an organized management strategy is proposed.
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Abstract
Of all the factors contributing to breast cancer risk, a strong family history of the disease is the most powerful. Familial clustering is said to have been noted by the Ancient Romans but formal documentation began in the mid-nineteenth century (reviewed in Ref. 1). The French physician Paul Broca noted that in one family (probably his wife's) over four generations 10 out of 24 women had died from breast cancer while several more individuals, of both sexes, had suffered other malignancies. He concluded that this very large excess of cancers could not reasonably be attributed to chance. At the same time he recognized that occasional familial clusters of relatively common conditions would be expected even in the absence of any genetic predisposition and discounted several published reports of 'hereditary cancers', including some of the families collected by his English contemporary Sir James Paget.
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Clayton J. Palliative care ministry to families. C.H.A.C. REVIEW 1991; 18:10-3. [PMID: 10104205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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