1. Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
2. Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore
3. Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
4. Department of Clinical Epidemiology, Institute of Infectious Diseases and Epidemiology, Tan Tock Seng Hospital, Singapore