1 Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada.
2 Division of Emergency Medicine, Department of Pediatrics, Montreal Children's Hospital, Montreal, QC, Canada.
3 Division of Pediatric Critical Care, Department of Pediatrics, BC Children's Hospital, 4500 Oak St, Vancouver, BC, V6H 2N9, Canada. Fiona.muttalib@cw.bc.ca.