1. Division of Pediatric Emergency Medicine, McMaster Childrens Hospital, Hamilton, ON, Canada
2. Pediatric Emergency Department, Meir Medical Center, Kefar Saba, Israel
3. Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
4. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada
5. St. Joseph’s Healthcare Hamilton, Hamilton, ON, Canada
6. Pediatric Emergency Department, Shamir (Assaf Harofeh) Medical Center, Zerifin, Israel
7. Affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel