Helena Liu1, Tamara Pringsheim1, Graham C Thompson2. 1. Faculty of Medicine and Dentistry (Liu), University of Alberta, Edmonton, Alta.; Departments of Clinical Neurosciences (Pringsheim) and Pediatrics (Pringsheim, Thompson), Faculty of Medicine, University of Calgary, Calgary, Alta; Pediatric Emergency Medicine (Thompson), Departments of Clinical Neurosciences and Pediatrics (Pringsheim), Alberta Children's Hospital, Calgary, Alta. 2. Faculty of Medicine and Dentistry (Liu), University of Alberta, Edmonton, Alta.; Departments of Clinical Neurosciences (Pringsheim) and Pediatrics (Pringsheim, Thompson), Faculty of Medicine, University of Calgary, Calgary, Alta; Pediatric Emergency Medicine (Thompson), Departments of Clinical Neurosciences and Pediatrics (Pringsheim), Alberta Children's Hospital, Calgary, Alta. graham.thompson@albertahealthservices.ca.