1. Division of Infectious Diseases, Department of Medicine, National University Health System, Singapore;
2. Yong Loo Lin School of Medicine, National University of Singapore, Singapore;
3. Infectious Diseases Translational Research Programme, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore;
4. Division of Dermatology, Department of Medicine, National University Health System, Singapore; and
5. Department of Pathology, National University Health System, Singapore.