1. Accident & Emergency Department, Changi General Hospital, Singapore Health Services, Singapore 529889, Singapore
2. Emergency Medicine Department, National University Hospital, National University Health System, Singapore 119074, Singapore
3. Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
4. Department of Anesthesia, National University Hospital, National University of Singapore, Singapore 119074, Singapore
5. Education Office, Sengkang General Hospital, Singapore Health Services, Singapore 554886, Singapore