1. Department of Dermatology; National University Hospital; Singapore Singapore
2. Research Support Unit; NUS Yong Loo Lin School of Medicine; Singapore Singapore
3. Dermatology; National University Hospital; Singapore Singapore
4. Internal Medicine; National University Hospital Singapore; Singapore Singapore
5. Biostatistics Unit; Yong Loo Lin School of Medicine; Singapore Singapore
6. c/o Cochrane Skin Group; The University of Nottingham; Nottingham UK
7. Alice Lee Center for Nursing Studies, Yong Loo Lin School of Medicine; National University of Singapore, National University Health System; Singapore Singapore