Affiliation: | a Department of Pediatrics, Montreal Children’s Hospital-McGill University Health Center, Montreal, Quebec, Canada b Center for Clinical Epidemiology and Evaluation, University of British Columbia, Vancouver, British Columbia, Canada c Department of Medicine, University of Sherbrooke, Sherbrooke, Quebec, Canada d Department of Diagnostic Imaging, Toronto Hospital for Sick Children, Toronto, Ontario, Canada e Department of Pediatrics, Toronto Hospital for Sick Children, Toronto, Ontario, Canada. |