1 National Centre for Infectious Diseases, Singapore; Duke-NUS Graduate Medical School, National University of Singapore, Singapore; Department of Infectious Diseases, Singapore General Hospital, Singapore.
2 National Centre for Infectious Diseases, Singapore; Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore.
3 National Centre for Infectious Diseases, Singapore; Saw Swee Hock School of Public Health, National University of Singapore, Singapore; Communicable Diseases Group, Ministry of Health, 169854, Singapore. Electronic address: [email protected].