1. Division of Neurology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
2. Department of Emergency Medicine, King Abdulaziz Medical City, Riyadh, Saudi Arabia
3. Department of Emergency Medicine, University of Calgary, Calgary, Alberta, Canada
4. Department of Cardiology, University of Alberta, Edmonton, Alberta, Canada
5. Department of Emergency Medicine, Division of Medical Toxicology, University of Southern California, Verdugo Hills Hospital, Los Angeles, USA
6. Department of Emergency Medicine, Division of Clinical Pharmacology and Toxicology, Poison and Drug Information Service, University of Calgary, Calgary, Alberta, Canada