1 Division of Infectious Diseases, Department of Medicine, National University Health System, Singapore.
2 Department of Medicine, National University Health System, Singapore.
3 Fast and Chronic Programmes, Alexandra Hospital, National University Health System, Singapore.
4 Division of Respiratory and Critical Care Medicine, Department of Medicine, National University Health System, Singapore.
5 Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
6 Infectious Diseases Translational Research Programme, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
7 Division of Microbiology, Department of Laboratory Medicine, National University Hospital, Singapore.