1. Centre for Research in Family Health, IWK Health Centre, Halifax, Nova Scotia, Canada
2. Pediatric Research in Perioperative Care Lab, IWK Health Centre, Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
3. Department of Surgery, IWK Health Centre, Dalhousie University, Halifax, Nova Scotia, Canada
4. Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
5. Departments of Otolaryngology–Head and Neck Surgery and Health Policy and Management, Johns Hopkins Medical Institutions, Baltimore, Maryland, USA