1. Division of Pediatric Emergency Medicine, Department of Pediatrics, Montreal Children's Hospital, McGill University Health Centre, Montreal, Quebec, Canada
2. Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Quebec, Canada
3. Division of Pediatric Emergency Medicine, Department of Pediatrics, British Columbia Children’s Hospital, University of British Columbia, Vancouver, British Columbia, Canada
4. British Columbia Children's Hospital Research Institute, University of British Columbia, Vancouver, British Columbia, Canada
5. Department Obstetrics and Gynaecology, University of British Columbia, Vancouver, British Columbia, Canada
6. Division of Pediatric Emergency Medicine, Department of Emergency Medicine, King Abdulaziz University, Jeddah, Saudi Arabia