1 Department of Clinical Epidemiology, Office of Clinical Epidemiology, Analytics, and Knowledge, Tan Tock Seng Hospital, Singapore. Electronic address: hanleyho@gmail.com.
2 Department of Clinical Epidemiology, Office of Clinical Epidemiology, Analytics, and Knowledge, Tan Tock Seng Hospital, Singapore.
3 Department of Infection Prevention and Control, Tan Tock Seng Hospital, Singapore; National Centre for Infectious Diseases, Singapore.