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Hauner H, Buchholz G, Hamann A, Husemann B, Koletzko B, Liebermeister H, Wabitsch M, Westenhöfer J, Wirth A, Wolfram G. Adipositas und Diabetes mellitus. DIABETOL STOFFWECHS 2012. [DOI: 10.1055/s-0032-1325578] [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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Abstract
The genetic variability of the genus Phaseolus was investigated by nonradioactive DNA fingerprinting. The simple repetitive sequences (GATA)4, (GACA)4, (CAC)5, and (CA)8 were used as probes to differentiate 18 species comprised of 90 genotypes. (GATA)4, (CAC)5, and (CA)8 could be detected in the genome of nearly all species, while the (GACA)4 motif occurred only in 13 species. Almost all fragments that hybridized with (GACA)4 also hybridized with (GATA)4. All but two cultivars of Phaseolus vulgaris, P. lunatus, P. acutifolius, and P. polyanthus showed specific banding patterns with (GATA)4. The other repetitive motifs revealed only limited or no intraspecific variation. In P. vulgaris, two group-specific patterns were found with (GATA)4, giving further evidence for a Middle American and an Andean origin of the P. vulgaris genotypes. The high intraspecific pattern variation that was revealed with (GATA)4 in the predominantly self-pollinating species P. vulgaris and P. lunatus can probably be explained by there being at least two primary centres of domestication and, hence, genetic diversification. In cross-pollinating species (e.g., P. coccineus), the observed intraspecific variation was, surprisingly, rather low. The present study shows that DNA fingerprinting with microsatellites successfully distinguishes among gene pools, cultivars, and, in some cases, among individuals.
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Gallwitz B, Hamann A, Bachmann O, Haupt A. Synergien nutzen: Insulin plus GLP-1-Rezeptoragonisten - innovative Therapiestrategie mit Zukunft? DIABETOL STOFFWECHS 2012. [DOI: 10.1055/s-0032-1313120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Roessler M, Reinhardt K, Lühmann U, Bickel A, Braun J, Böhne S, Gerberding B, Hamann A, Homann M, Monnig M, Panzer W, Ruff S, Flemming A. [Interhospital transport of intensive care patients in Lower Saxony : statewide need-based and effective management]. Anaesthesist 2011; 60:759-71. [PMID: 21842251 DOI: 10.1007/s00101-011-1925-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND Since 2007 interhospital transport of intensive care patients in Lower Saxony appertains to the performance requirements of emergency medical services. Against this background the Working Group for Evaluation of Intensive Care Transport (Arbeitsgemeinschaft Evaluation Intensivverlegung) was established. This group formulated standardized definitions for the requirements of intensive care transport vehicles and a federal statewide monitoring of intensive care transport was implemented to analyze if simultaneously on-call intensive care transport systems (intensive care helicopter and ground based mobile intensive care units) can be deployed need-based and efficiently. METHODS A prospective follow-up study and evaluation of intensive care transport in Lower Saxony between April 1(st) 2008 and July 31(st) 2010 was carried out. RESULTS A total of 6,779 data records were evaluated in this study of which 4,941 (72.9%) missions were located in Lower Saxony, 2,928 (43.2%) missions were carried out by helicopters and 3,851 (56.8%) by ground based mobile intensive care units. The mean duration of a mission was 3 h 59min±2 h 25 min, 4 h 39 min±2 h 23 min by ground based mobile intensive care units and 2 h 21 in±30 min by helicopter units. All systems proved to be feasible for intensive care transport. The degree of urgency was estimated correctly in 94.8% of the evaluated missions and 58.0% of the transfers could not be deployed. In 76.8% patients were transferred to hospitals with a higher level of medical care, 51.7% of patients were transferred for intensive care therapy and 40.4% for an operation/intervention. Of the patients 38.2% required mechanical ventilation and in 48.3% invasive monitoring was carried out. CONCLUSION Interhospital transfer of intensive care patients can be carried out need-based with a limited number of intensive care transport vehicles if the missions are deployed effectively by standardized disposition in accordance with performance requirements.
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Hauner H, Buchholz G, Hamann A, Husemann B, Koletzko B, Liebermeister H, Wabitsch M, Westenhöfer J, Wirth A, Wolfram G. Adipositas und Diabetes mellitus. DIABETOL STOFFWECHS 2011. [DOI: 10.1055/s-0031-1283766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Grulich-Henn J, Lichtenstein S, Hörster F, Hoffmann GF, Nawroth PP, Hamann A. Moderate weight reduction in an outpatient obesity intervention program significantly reduces insulin resistance and risk factors for cardiovascular disease in severely obese adolescents. Int J Endocrinol 2011; 2011:541021. [PMID: 21904547 PMCID: PMC3166723 DOI: 10.1155/2011/541021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 05/23/2011] [Accepted: 06/24/2011] [Indexed: 11/18/2022] Open
Abstract
Background. Metabolic risk factors like insulin resistance and dyslipidemia are frequently observed in severly obese children. We investigated the hypothesis that moderate weight reduction by a low-threshold intervention is already able to reduce insulin resistance and cardiovascular risk factors in severely obese children. Methods. A group of 58 severely obese children and adolescents between 8 and 17 years participating in a six-month-long outpatient program was studied before and after treatment. The program included behavioral treatment, dietary education and specific physical training. Metabolic parameters were measured in the fasting state, insulin resistance was evaluated in an oral glucose tolerance test. Results. Mean standard deviation score of the body mass index (SDS-BMI) in the study group dropped significantly from +2.5 ± 0.5 to 2.3 ± 0.6 (P < 0.0001) after participation in the program. A significant decrease was observed in HOMA (6.3 ± 4.2 versus 4.9 ± 2.4, P < 0.03, and in peak insulin levels (232.7 ± 132.4 versus 179.2 ± 73.3 μU/mL, P < 0.006). Significant reductions were also observed in mean levels of hemoglobin A(1c), total cholesterol and LDL cholesterol. Conclusions. These data demonstrate that already moderate weight reduction is able to decrease insulin resistance and dyslipidemia in severely obese children and adolescents.
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Hamann A, Lamago D, Wolf T, von Löhneysen H, Reznik D. Magnetic blue phase in the chiral itinerant magnet MnSi. PHYSICAL REVIEW LETTERS 2011; 107:037207. [PMID: 21838402 DOI: 10.1103/physrevlett.107.037207] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2010] [Indexed: 05/31/2023]
Abstract
Chiral nematic liquid crystals sometimes form blue phases characterized by spirals twisting in different directions. By combining model calculations with neutron-scattering experiments, we show that the magnetic analogue of blue phases does form in the chiral itinerant magnet MnSi in a large part of the phase diagram. The properties of this blue phase explain a number of previously reported puzzling features of MnSi such as partial magnetic order and a two-component specific-heat and thermal-expansion anomaly at the magnetic transition.
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Hauner H, Buchholz G, Hamann A, Husemann B, Koletzko B, Liebermeister H, Wabitsch M, Westenhöfer J, Wirth A, Wolfram G. Adipositas und Diabetes mellitus. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1262627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hamann A. [Drug therapy or surgical treatment of obesity--for drug therapy]. Dtsch Med Wochenschr 2010; 135:1692. [PMID: 20721845 DOI: 10.1055/s-0030-1262462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hamann A, Renard E, Guerci B, Vergès B, Papadia F. Das TANTALUS®System verbessert die Leberfunktion bei Patienten mit Typ 2 Diabetes. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hauner H, Buchholz G, Hamann A, Husemann B, Koletzko B, Liebermeister H, Wabitsch M, Westenhöfer J, Wirth A, Wolfram G. Adipositas und Diabetes mellitus. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1224578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Kausch C, Hamann A, Niendorf A, Joost HG, Dreyer M, Rüdiger HW, Holman GD, Greten H, Matthaei S. O-50: A novel mechanism of cellular insulin resistance: Defective insulin-stimulated glucose transport due to malinsertion of glucose transporters into the plasma membrane of fibroblasts from a patient with an insulin resistance syndrome. Exp Clin Endocrinol Diabetes 2009. [DOI: 10.1055/s-0029-1211541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
The high prevalence of obesity and its well documented association with the cardiovascular risk factors diabetes mellitus, dyslipidemia and hypertension represents a major problem for the general health status of industrialized societies. Although numerous studies have shown that genetic factors have a major influence on the regulation of energy homeostasis and the susceptibility to obesity, the genes and predisposing mutations involved are insufficiently understood. Among several known rodent models of obesity due to single gene mutations, mice homozygous for the obese (ob) gene exhibit massive early-onset obesity, hyperphagia, non-insulin-dependent diabetes mellitus, defective thermoregulation and infertility. Recently the ob gene was identified by positional cloning and shown to be mutated in ob/ob mice. Leptin, the product of the ob gene, is a 167-amino acid secreted protein that is synthesized exclusively in adipose tissue. With the exception of ob/ob mice, circulating plasma leptin is elevated in obesity. Administration of recombinant leptin to ob/ob mice reduces fat mass, food intake, hyperglycemia and hyperinsulinemia. The various effects of the hormone are mediated by leptin receptors expressed at high levels in the hypothalamus, but also in several other non-neuronal tissues. A mutation in the leptin receptor gene is responsible for the obese phenotype of db/db mice. Plasma leptin in humans is positively correlated with body fat mass, suggesting that leptin resistance rather than leptin deficiency is a common feature of human obesity. This review briefly summarizes the current status of the rapidly growing evidence that leptin plays an important role in the regulation of body weight and fat deposition.
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Syrbe U, Hamann A. [Tissue retention of T cells as a therapeutic target in rheumatoid arthritis]. Z Rheumatol 2009; 68:678-82. [PMID: 19585131 DOI: 10.1007/s00393-009-0496-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Autoreactive T cells are instrumental for the induction and chronification of autoimmune diseases. While immigration of T cells into inflamed tissue is strongly enhanced during acute inflammatory phases, retention of antigen specific T cells rather than subsequent recruitment of recirculating effector cells appears to contribute to the inflammatory infiltrate seen during chronic inflammation. Patients suffering from rheumatoid arthritis also show accumulation of oligoclonal T cells within the inflamed synovia, where environmental signals seem to promote the prolonged survival of these chronically activated T cells. The survival signals and mechanisms controlling retention of T cells within the inflamed synovia are poorly characterized. However, the specific interference with these mechanisms could be a therapeutic approach in chronic inflammatory diseases like rheumatoid arthritis that are accompanied by a strong local accumulation of immune cells.
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Rudofsky G, Schlotterer A, Reismann P, Engel J, Grafe IA, Tafel J, Morcos M, Humpert PM, Nawroth P, Bierhaus A, Hamann A. The -174G>C IL-6 gene promoter polymorphism and diabetic microvascular complications. Horm Metab Res 2009; 41:308-13. [PMID: 19140096 DOI: 10.1055/s-0028-1119373] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This study examined a possible association of the G>C polymorphism at nucleotide -174 in the promoter region of the interleukin-6 (IL-6) gene (rs1800795) with the prevalence of diabetic complications in 235 patients with type 1 and 498 patients with type 2 diabetes. Genotyping was performed using polymerase chain reaction (PCR) and subsequent cleavage by Nla III restriction endonuclease. Analyzing all diabetic patients together demonstrated that 301 patients (41.1%) carried the GG genotype, 114 (15.6%) the CC genotype, and 318 (43.3%) were heterozygous for the GC genotype. However, there was no correlation of any of the genotypes with the prevalence of diabetic nephropathy or diabetic neuropathy, but subjects with the CC genotype had a significantly higher prevalence of diabetic retinopathy compared to patients with the GC and GG genotype (p=0.016). This association was mainly lost when a logistic regression model was adjusted for diabetes duration (p=0.07). Consistently, a weak but not significant association of the polymorphism with diabetic retinopathy was observed when type 1 and type 2 diabetic patients were analyzed separately (patients with type 1 diabetes: p=0.12; patients with type 2 diabetes: p=0.09). Analogically, no association of the polymorphism was found for diabetic nephropathy or diabetic neuropathy in these groups. In conclusion these data suggest no major influence of the -174G>C variant in the promoter region of the IL-6 gene on the development of microvascular complications in patients with diabetes.
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Horas U, Herbst U, Hamann A, Ernst S. [Necrotizing fasciitis caused by group G streptococci]. DER ORTHOPADE 2008; 37:592-4. [PMID: 18461304 DOI: 10.1007/s00132-008-1261-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Necrotizing fasciitis is a soft tissue infection which is highly lethal. Its lethality can only be reduced by early diagnosis and radical débridement. A delayed diagnosis will result in streptococcal toxic shock syndrome. Any surgery neglecting radical débridement up to amputation is inadequate and cannot reduce lethality. This paper reports on two cases of necrotizing fasciitis of the leg caused by group G streptococci.
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Morcos M, Schlotterer A, Sayed AAR, Kukudov G, Oikomonou D, Ibrahim Y, Pfisterer F, Schneider J, Bozorgmehr F, Rudofsky G, Schwenger V, Kientsch-Engels R, Hamann A, Zeier M, Dugi K, Yard B, Humpert PM, van der Woude F, Nawroth PP, Bierhaus A. Rosiglitazone reduces angiotensin II and advanced glycation end product-dependent sustained nuclear factor-kappaB activation in cultured human proximal tubular epithelial cells. Horm Metab Res 2008; 40:752-9. [PMID: 18711692 DOI: 10.1055/s-0028-1082039] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Tubular damage is a major feature in the development of diabetic nephropathy. This study investigates the effects of the thiazolidindione rosiglitazone on angiotensin II and advanced glycation end product-induced tubular activation in human proximal tubular epithelial cells IN VITRO. Angiotensin II and advanced glycation end products, both induced a dose-dependent sustained activation of the redox-sensitive transcription factor, Nuclear Factor KAPPA B (NF-kappaB). Nuclear translocation of NF-kappaB was evident already after one hour and persistent for more than four days. Co-incubation of proximal tubular epithelial cells with rosiglitazone significantly reduced angiotensin II and advanced glycation end product-mediated generation of reactive oxygen species, angiotensin II-dependent advanced glycation end product formation, NF-kappaB activation, and NF-kappaB-dependent pro inflammatory gene expression. Most importantly, rosiglitazone effects on NFkappaB activation were maximal at later time points, indicating that rosiglitazone treatment confers long lasting renoprotective effects.
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Rosenstock J, Chou HS, Matthaei S, Seidel DK, Hamann A. Potential benefits of early addition of rosiglitazone in combination with glimepiride in the treatment of type 2 diabetes. Diabetes Obes Metab 2008; 10:862-73. [PMID: 18201206 DOI: 10.1111/j.1463-1326.2007.00815.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM To assess the efficacy and tolerability of early combination therapy with rosiglitazone (RSG) and glimepiride (GLIM) vs. GLIM monotherapy in patients with type 2 diabetes mellitus (T2DM). METHODS Strategies for the addition of RSG in combination with GLIM were evaluated with data from two randomized, double-blind, placebo (PBO)-controlled studies. Study A - addition of RSG (4 or 8 mg) or PBO to continued GLIM 3 mg once daily; study B - addition of low-dose RSG (4 mg) prior to uptitration of GLIM (from 2 to 4 mg) vs. continued uptitration of GLIM (from 2 to 8 mg). RESULTS Study A reported significant reductions in fasting plasma glucose (FPG) from baseline to week 26 with the addition of both 4 and 8 mg RSG to GLIM 3 mg [-21 mg/dl (-1.2 mmol/l), p = 0.0019 and -43 mg/dl (-2.4 mmol/l), p < 0.0001, respectively] and in haemoglobin A(1c) (HbA(1c)) (-0.63%, p = 0.00015 and -1.17%, p < 0.0001, respectively) from a baseline of 8.2 and 8.1%, respectively. At the end of the study, target HbA(1c) <7.0% was achieved in 43 and 68% of patients in the RSG 4 mg + GLIM and RSG 8 mg + GLIM groups, respectively, compared with 32% in the PBO + GLIM (GLIM alone) group. In study B, addition of RSG to GLIM reduced mean FPG and HbA(1c) levels at week 24 from baseline [-28 mg/dl (-1.5 mmol/l), p < 0.0001, and -0.68%, p < 0.0001, respectively]. There were no significant changes with GLIM monotherapy in either study. Favourable effects of RSG + GLIM on insulin sensitivity, beta-cell function and cardiovascular disease biomarkers were also observed. All treatments were similarly well tolerated. CONCLUSIONS Early addition of RSG to GLIM is an effective and well-tolerated treatment option to improve glycaemic control in sulphonylurea-treated patients with T2DM.
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Hauner H, Buchholz G, Hamann A, Husemann B, Koletzko B, Liebermeister H, Wabitsch M, Westenhöfer J, Wirth A, Wolfram G. Adipositas und Diabetes mellitus. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1004680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Wagner S, Reißhauer A, Hamann A, Egert M, Conradi E. Critical-Illness-Polyneuropathie und die daraus resultierenden Funktionsdefizite im Rahmen der Frührehabilitation. PHYSIKALISCHE MEDIZIN REHABILITATIONSMEDIZIN KURORTMEDIZIN 2008. [DOI: 10.1055/s-2008-1061829] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Blüher M, Hamann A. Adipositas und metabolisches Syndrom. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1004703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Schlotterer A, Hamann A, Kukudov G, Ibrahim Y, Bozorgmehr F, Humpert P, Bierhaus A, Nawroth PP, Morcos M. Repression des mitochondrialen DNA-Reparatursystems schädigt das neuronale System und verkürzt die Lebensspanne von C. elegans. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rudofsky G, Reismann P, Djuric Z, Humpert PM, Isermann B, Hamann A, Morcos M, Nawroth PP, Bierhaus A. Vergleichende Untersuchungen zum Einfluss von hochdosierter Statintherapie und Statin-Ezetimib-Kombinationstherapie auf Entzündungsparameter bei Typ-2-Diabetes. DIABETOL STOFFWECHS 2008. [DOI: 10.1055/s-2008-1076192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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