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Letters to the Editor

Cassidy, J. David, PhD, DrMedSc

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Division of Health Care and Outcomes Research, Toronto Western Research Institute, Division of Epidemiology, Dalla Lana School of Public Health, Clinical Epidemiology Program, Department of Health Policy, Management and Evaluation, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada

© 2011 Lippincott Williams & Wilkins, Inc.