1. Department of Emergency Medicine, The University of British Columbia, Vancouver, Canada
2. Emergency Department, Royal Columbian Hospital, New Westminster, Canada
3. Department of Medicine, The University of British Columbia, Vancouver, Canada
4. British Columbia Drug and Poison Information Centre, Vancouver, Canada
5. Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, Canada
6. Laboratory Medicine and Pathology Regional Service, Royal Columbian Hospital, Fraser Health, New Westminster, BC, Canada