1. Department of Emergency Medicine, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China
2. Hong Kong Poison Information Centre, Hospital Authority, Hong Kong Special Administrative Region, China
3. School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China
4. Accident and Emergency Department, Queen Mary Hospital, Hong Kong Special Administrative Region, China