1. Department of Emergency Medicine, Singapore General Hospital, Singapore
2. Health Services Research Unit, Singapore General Hospital, Singapore
3. Department of Emergency Medicine, Sengkang General Hospital, Singapore
4. Accident and Emergency Department, Changi General Hospital, Singapore
5. Accident and Emergency Department, Woodlands Health, Singapore
6. Health Services and Systems Research, Duke-NUS Medical School, Singapore
7. Emergency Medicine Department, National University Hospital, National University Health System, Singapore
8. Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore