1 Emergency Medicine, Department of Acute Medicine, University Hospital, Basel, Switzerland.
2 Department of Clinical Research, Emergency Medicine Research, University of Basel, Basel, Switzerland.
3 Division of Pediatric Emergency Medicine, Department of Pediatrics, Montreal Children's Hospital, McGill University Health Centre, 1001 Decarie Blvd, Montreal, QC, H4C 3J1, Canada. brett.burstein@mail.mcgill.ca.
4 Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, QC, Canada. brett.burstein@mail.mcgill.ca.