School of Epidemiology & Public Health (Gardner, Currie, Colman), University of Ottawa; Children's Hospital of Eastern Ontario Research Institute (Gardner, Cloutier, Zemek, Cappelli); Departments of Psychiatry (Pajer) and Pediatrics (Zemek), University of Ottawa; The Ottawa Hospital Research Institute (Hatcher, Lima); ICES uOttawa (Lima), Ottawa, Ont.