151
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Fontanesi I, Hamilton R, Wein R, Pitman A, Evans M. The use of brachytherapy in the initial management of advanced head and neck cancer. Radiother Oncol 2007. [DOI: 10.1016/s0167-8140(07)80216-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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152
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Partridge M, Ownby D, Hamilton R, Young P, Ford J. Maturation of the IgE and IgG response to Imported Fire Ant Venom during natural exposure. J Allergy Clin Immunol 2007. [DOI: 10.1016/j.jaci.2006.11.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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153
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Li T, Schreibmann E, Koong A, Xu Q, Hamilton R, Xing L. 2710. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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154
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Miedema BB, Easley J, Hamilton R. Young adults' experiences with cancer: comments from patients and survivors. CANADIAN FAMILY PHYSICIAN MEDECIN DE FAMILLE CANADIEN 2006; 52:1446-7. [PMID: 17279205 PMCID: PMC1783700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
OBJECTIVE To examine the experiences with cancer of adults diagnosed when between 20 and 35 years old. DESIGN Qualitative study using semistructured interviews. SETTING Largest health care region in the province of New Brunswick. PARTICIPANTS Six men and 9 women cancer patients and survivors. METHOD Fifteen adults interviewed when between the ages of 20 and 43 representing a variety of cancers and stages of disease were recruited for this study. Interviews were guided by a set of open-ended questions and explored participants' experiences with cancer from initial presentation of symptoms through to survivorship issues. MAIN FINDINGS The most important clinical issue that emerged from the analysis was that participants' youth appeared to contribute to delays in diagnosis of cancer. These delays were attributed to either patients' or physicians' inaction. Some patients attributed their initial cancer symptoms to the adverse effects of alcohol or excessive partying; others feared a bad diagnosis and delayed seeking help. Family physicians frequently interpreted nonspecific symptoms as resulting from patients' lifestyle choices and were reluctant to consider a diagnosis of cancer. Several family physicians reportedly believed that persistent symptoms could not be the result of cancer because patients were too young. CONCLUSION Although cancer is relatively rare in young adults, family physicians need to include it in differential diagnoses. Both patients and physicians tend to minimize cancer symptoms in young adults. Delays in diagnosis might not affect health outcomes, but can cause distress to young adults with cancer.
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155
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Creutzenberg O, Oberdörster G, Coogan L, Moll W, Hamilton R, Ziemann C, Muhle H. Inflammatory effects of two quartz samples after intratracheal instillation in a 90-day study with rats. Toxicol Lett 2006. [DOI: 10.1016/j.toxlet.2006.06.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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156
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Xu Q, Hamilton R, Jiang S. SU-FF-J-24: An Optical Flow Based Motion Tracking Method Using Fluoroscopic Video. Med Phys 2006. [DOI: 10.1118/1.2240803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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157
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Xu Q, He Z, Hamilton R, Xing L. SU-FF-J-116: Registration of X-Ray Portal Images with 4DCT DRRs for Patient Setup Verification. Med Phys 2006. [DOI: 10.1118/1.2240892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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158
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Watchman C, Hamilton R, Welsh J. SU-FF-J-78: Implanted Marker Movements During Prostate IMRT. Med Phys 2006. [DOI: 10.1118/1.2240855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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159
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Xu Q, Hamilton R. WE-C-J-6C-03: A Novel Respiratory Gating Method Based On Automated Analysis of Ultrasonic Diaphragm Motion. Med Phys 2005. [DOI: 10.1118/1.1998508] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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160
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Hamilton R. Medical education for the future. J R Soc Med 2005. [DOI: 10.1258/jrsm.98.5.208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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161
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Hamilton R, Casasús A, Rasche M, Narang A, Svoronos SA, Koopman B. Structured model for denitrifier diauxic growth. Biotechnol Bioeng 2005; 90:501-8. [PMID: 15803468 DOI: 10.1002/bit.20462] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We present a model for diauxic growth of denitrifying bacteria in which nitrate reductase synthesis kinetics dominate the overall growth kinetics. The model is based on the assumption of the existence of a nitrate respiration operon, thereby linking the rate of nitrate uptake to the activity of nitrate reductase. We show that this approach can model diauxic growth of Pseudomonas denitrificans by conducting experiments in which nitrate reductase activity was measured during both lag and ensuing exponential growth phases. We consistently observed the pattern of low nitrate reductase enzyme activity during the lag phase, increasing before the onset of growth. By fitting model parameters we were able to successfully match experimental data for growth, nitrate uptake, and enzyme activity level.
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162
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Metcalfe G, Rudman M, Brydon A, Graham LJW, Hamilton R. Composing chaos: An experimental and numerical study of an open duct mixing flow. AIChE J 2005. [DOI: 10.1002/aic.10640] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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163
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Walls J, Sanatani S, Hamilton R. Post-hoc diagnosis of congenital long QT syndrome in patients with tetralogy of Fallot. Pediatr Cardiol 2005; 26:107-10. [PMID: 15793661 DOI: 10.1007/s00246-004-0712-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
This report describes two patients diagnosed with congenital long QT syndrome after surgical repair of tetralogy of Fallot. Despite the fact that both patients had preoperative electrocardiograms demonstrating QT prolongation, neither was diagnosed until long after their surgeries, when they or their relatives presented with symptoms of long QT syndrome. A brief discussion highlights the reasons why long QT syndrome may be overlooked in patients with structural heart defects and the clinical importance of identifying these patients preoperatively.
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164
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Wright A, Miller S, Hamilton R. 141 CASE REPORT: A PATIENT WITH CYSTIC FIBROSIS AND LUNG CANCER. J Investig Med 2005. [DOI: 10.2310/6650.2005.00006.140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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165
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Crabbe H, Barber A, Bayford R, Hamilton R, Jarrett D, Machin N. The use of a European telemedicine system to examine the effects of pollutants and allergens on asthmatic respiratory health. THE SCIENCE OF THE TOTAL ENVIRONMENT 2004; 334-335:417-26. [PMID: 15504527 DOI: 10.1016/j.scitotenv.2004.04.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/01/2004] [Indexed: 05/20/2023]
Abstract
The experience of using a telemedicine feasibility study to integrate respiratory health response and environmental stimuli information is presented. The effects of ambient air quality, pollen and local environment conditions on asthmatic patients' lung function were investigated through the use of a novel European health telematic system. The Medical Diagnosis, Communication and Analysis Throughout Europe (MEDICATE) project developed and tested the feasibility of using a telemedicine system for chronic asthmatics in London, UK, and Barcelona, Spain. The key to this was the determination of the real time health (lung function) response to the ambient environment and allergens. Air quality, pollen and environmental lifestyle information were related to respiratory measurements for recruited asthmatic patients in the study through the design of a dedicated environmental management system (EMS) database. In total, 28 patients completed the study trial, subject to ambulatory monitoring of spirometric lung function (PEF, FEV(1) and FVC) up to four times a day over a 2-week period recorded during the year 2000. Alongside this, ambient air quality and pollen counts were used to represent local exposure to potential environmental stimuli. Personal questionnaire interviewing collected additional data about patient lifestyles, social-economic conditions and quality of life perceptions. The methods and indicative results of integrating environmental and health data in this respect are examined. Assessment tools such as GIS and object-orientated databases were designed to locate and compile environmental information about the patients' locations and lifestyles in the study areas (London and Barcelona). Socioeconomic and lifestyle factors, such as exposure to smoking, pets, personal journey lengths and modes, income, household occupancy and domestic fuel use, were found to have limited detectable effects on the patients' basic lung function levels. Patients' gender, age and predicted PEFR were significantly associated with the 2-week mean and minimum respiratory measurements. Lung function data were compared with air quality and pollen indicators to examine relationships on a daily or lagged-day basis controlling for confounding factors. The paper discusses the new methodology and the practicalities of using the telemedical system as a tool for assessing the impacts of environmental stimuli on respiratory health.
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166
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Hamilton R. Quinine-induced disseminated intravascular coagulation: Case report and review of the literature. Ann Emerg Med 2004. [DOI: 10.1016/j.annemergmed.2004.07.443] [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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167
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Jani AB, Blend MJ, Hamilton R, Brendler C, Pelizzari C, Krauz L, Sapra B, Vijayakumar S, Awan A, Weichselbaum RR. Radioimmunoscintigraphy for post-prostatectomy radiotherapy: Analysis of toxicity and biochemical control. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.4660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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168
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Frangoul H, Fowler K, Hamilton R, Billheimer D, Wu H, Mullins E, Mulder J, Poedling K. Survey of hospice referral practices among 541 pediatric oncologists. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.8074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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169
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Hamilton R. Can cardiac vagal tone be estimated from the 10-second ECG? Int J Cardiol 2004. [DOI: 10.1016/j.ijcard.2003.07.002] [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: 10/26/2022]
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170
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Sanatani S, Chiu C, Nykanen D, Coles J, West L, Hamilton R. Evolution of heart rate control after transplantation: conduction versus autonomic innervation. Pediatr Cardiol 2004; 25:113-8. [PMID: 14647999 DOI: 10.1007/s00246-003-0387-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In cardiac transplantation, the donor organ is not initially innervated and demonstrates decreased heart rate variability (HRV). However, HRV may improve after several months. The mechanism for HRV improvement has not been elucidated; autonomic "reinnervation" of the donor heart has been proposed. The role of atrioatrial conduction from recipient to donor organ has not been evaluated. We prospectively evaluated cardiac transplant patients with a limited electrophysiology study at the time of their surveillance biopsies. Recordings were made of recipient and donor signals, observing conduction properties between recipient and donor atria. Holter recordings were analyzed and HRV was determined using spectral analysis techniques, recording mean RR interval, low-frequency power (LF), high-frequency power (HF), and the LF/HF ratio. These were compared to published norms. From November 1999 to May 2000, 21 patients (6 female) who underwent cardiac transplantation participated at a median age of 101 months (range, 4.1-217 months). Time posttransplant ranged from 26 days to 71 months. Holter data were available for 20 patients and demonstrated dissociated P waves in 13 (65%). The mean heart rate on Holter was 111 beats per minute (bpm) (range, 85-161 bpm). We were able to record distinct recipient atrial signals in 16 of 21 (76%) patients. The average recipient tissue heart rate was 55% that of the donor heart rate. We documented atrioatrial association in only 1 patient. HRV did not reach normal values for most patients and did not increase with time posttransplantation. The LF values were in the normal range for most patients, whereas 3 patients had normal HF values and 2 patients had values just below normal. Recipients of heart transplantation have a predominantly sympathetic influence of HRV. These preliminary data suggest that atrioatrial conduction does not play a role in reestablishing normal heart rate control following pediatric cardiac transplantation.
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171
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Lee DU, Casasús-Zambrana A, Hamilton R, Svoronos S, Lee SI, Koopman B. Significance of denitrifying enzyme dynamics in biological nitrogen removal processes: a simulation study. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2004; 49:265-272. [PMID: 15137433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Activated Sludge Model No. 1 (ASM1) was extended to include the enzyme kinetics of denitrifying bacteria switching between oxygen and nitrate as electron acceptors. The extended ASM1 (eASM1) model was applied to two different periodic process configurations, fed-batch and Biodenipho, commonly used for nitrogen removal from wastewater. Predictions of optimal unaerated volume fraction (UVF) by eASM1 were similar to those by ASM1 for both the fed-batch and Biodenipho processes. However, eASM1 predicted substantially longer optimal cycle lengths than ASM1 for both processes. Predictions of optimal UVF and cycle length for the Biodenipho process by eASM1 were closer to current operational values for the University of Florida Biodenipho process than predictions by ASM1.
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172
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Vohra S, Hornberger L, Stephens D, Hamilton R. Maternal Hypothyroidism and Congenital Heart Disease: Is There a Relationship? Paediatr Child Health 2003. [DOI: 10.1093/pch/8.suppl_b.40ba] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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173
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Wolf B, Schwindt C, Hamilton R, Bollinger M. There's a bug in the system. J Allergy Clin Immunol 2003. [DOI: 10.1016/s0091-6749(03)80447-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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174
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Hamilton R, Dunsmuir RA. Radiographic assessment of the relative lengths of the bones of the fingers of the human hand. JOURNAL OF HAND SURGERY (EDINBURGH, SCOTLAND) 2002; 27:546-8. [PMID: 12475513 DOI: 10.1054/jhsb.2002.0822] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The study assessed whether a relationship existed between the lengths of the phalanges of the fingers of the hand. The centres of rotation of the joints in each finger were determined by dissection of cadaveric hands. Using these data, the distances between the joint centres was determined on anteroposterior hand X-rays taken for clinical purposes. The study has shown that, for all the fingers, there is a ratio of 1 for the distance between the metacarpophalangeal and proximal interphalangeal joint and the distance between the proximal interphalangeal joint and the finger tip. The ratio for the distances between the interphalangeal joints and the distal joint and the tip approximates to 1.3 for the index, middle and ring fingers and to 1.0 for the little finger. No evidence was found to support Littler's hypothesis that the interarticular distances of the finger follow the Fibonacci sequence.
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175
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Ballantyne SA, O'Neill G, Hamilton R, Hollman AS. Observer variation in the sonographic measurement of optic nerve sheath diameter in normal adults. EUROPEAN JOURNAL OF ULTRASOUND : OFFICIAL JOURNAL OF THE EUROPEAN FEDERATION OF SOCIETIES FOR ULTRASOUND IN MEDICINE AND BIOLOGY 2002; 15:145-9. [PMID: 12423741 DOI: 10.1016/s0929-8266(02)00036-8] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
AIM To quantify the observer variation in the sonographic measurement of optic nerve sheath diameter (ONSD) in normal adults. MATERIALS AND METHODS Sixty-seven normal adult volunteers underwent ultrasound examination of each eye by three independent observers using a 7 MHz sector probe. Three measurements were made of each eye by each observer and a mean value calculated for each eye. Median and 5th-95th centile values for both intra- and inter-observer variation were calculated for the three observers. RESULTS The median intra-observer variation was +/-0.1 mm, with 5th-95th centile values of +/-0-0.4 mm. The median inter-observer variation was +/-0.2-0.3 mm, with 5th-95th centile values of +/-0-0.7 mm. Careful review of examination technique by the three observers after the first 17 examinations was shown to reduce both intra- and inter-observer variation. CONCLUSION The sonographic measurement of ONSD is a readily learned, reproducible technique with low intra- and inter-observer variation. The average inter-observer variation (+/-0.2 mm) is comparable to the inherent variability of the ultrasound machine. The importance of standardisation of examination technique is stressed.
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