1 Children's Hospital of Eastern Ontario (CHEO) Research Institute (Nicholls, Benchimol); School of Epidemiology and Public Health, Faculty of Medicine (Nicholls, Benchimol), University of Ottawa, Ottawa, Ont.; London School of Hygiene and Tropical Medicine (Langan), London, UK; Department of Pediatrics (Benchimol), University of Ottawa, Ottawa, Ont. SNicholls@cheo.on.ca.
2 Children's Hospital of Eastern Ontario (CHEO) Research Institute (Nicholls, Benchimol); School of Epidemiology and Public Health, Faculty of Medicine (Nicholls, Benchimol), University of Ottawa, Ottawa, Ont.; London School of Hygiene and Tropical Medicine (Langan), London, UK; Department of Pediatrics (Benchimol), University of Ottawa, Ottawa, Ont.