1. Division of Infectious Diseases , Department of Medicine, , Singapore, 1E Kent Ridge Rd, Singapore 119228 , Singapore
2. National University Health System , Department of Medicine, , Singapore, 1E Kent Ridge Rd, Singapore 119228 , Singapore
3. Department of Medicine, National University Health System , Singapore, 1E Kent Ridge Rd, Singapore 119228 , Singapore
4. Yong Loo Lin School of Medicine, National University of Singapore , Singapore, 10 Medical Drive, Singapore 117597 , Singapore
5. Infectious Diseases Translational Research Programme , Department of Medicine, Yong Loo Lin School of Medicine, , Singapore, 10 Medical Drive, Singapore 117597 , Singapore
6. National University of Singapore , Department of Medicine, Yong Loo Lin School of Medicine, , Singapore, 10 Medical Drive, Singapore 117597 , Singapore