Abstract
Population Health Sciences, Research Institute, and Paediatric Outcomes Research Team, Division of Paediatric Medicine, Hospital for Sick Children, Toronto; Institute for Clinical Evaluative Sciences in Ontario, North York; Department of Public Health Sciences, University of Toronto; Clinical Epidemiology Unit, Sunnybrook and Women's College Health Science Centre, North York; and Department of Pediatrics, University of Toronto, Toronto, Ontario, Canada Lancet 1998;352:1813-1816
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