1. Biodefence Centre; Ministry of Defence; Singapore
2. Centre for Infectious Disease Epidemiology and Research; Saw Swee Hock School of Public Health; National University of Singapore; Singapore
3. National University Health System; Singapore
4. Department of Clinical Epidemiology; Tan Tock Seng Hospital; Singapore
5. Epidemiology & Disease Control Division; Ministry of Health; Singapore
6. National Public Health Laboratory; Ministry of Health; Singapore
7. Yale-NUS College; National University of Singapore; Singapore