1 Department of Dermatology, Singapore General Hospital, Singapore, Singapore.
2 SingHealth Duke-NUS Academic Medical Centre, Singapore, Singapore.
3 SingHealth Duke-NUS Emergency Medicine Academic Clinical Programme, Singapore, Singapore.
4 Duke-National University of Singapore Medical School, Singapore, Singapore.
5 Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
6 Duke-NUS Medical School, Singapore, Singapore.
7 Department of Respiratory and Critical Care Medicine, Singapore General Hospital, Singapore, Singapore.
8 Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University, Melbourne, Victoria, Australia.
9 Pre-hospital and Emergency Research Centre, Health Services & Systems Research, Duke-NUS Medical School, Singapore Department of Emergency Medicine, Singapore General Hospital, Singapore, Singapore.
10 Health Services Research Centre, Singapore Health Services, Singapore, Singapore.
11 Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore, Singapore.
12 Department of Emergency Medicine, KK Women's and Children's Hospital, Singapore, Singapore.
13 Department of Emergency Medicine, Singapore General Hospital, Singapore, Singapore.
14 Health Services & Systems Research, Duke-NUS Medical School, Singapore, Singapore.