1 Department of Microbiology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore. Electronic address: shireen.tan.y.l@singhealth.com.sg.
2 Duke-NUS Medical School, Singapore; Department of Infectious Diseases, Singapore General Hospital, Singapore.
3 Department of Microbiology, Singapore General Hospital, Singapore.
4 Department of Microbiology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore.