1 Department of Infectious Diseases, Singapore General Hospital, Singapore. Electronic address: ian.wee.l.e@singhealth.com.sg.
2 Department of Infection Prevention and Epidemiology, Singapore General Hospital, Singapore.
3 Department of Infectious Diseases, Singapore General Hospital, Singapore; Department of Infection Prevention and Epidemiology, Singapore General Hospital, Singapore.
4 Department of Infectious Diseases, Singapore General Hospital, Singapore.