1 Division of Infectious Diseases, Department of Medicine, National University Hospital, Singapore.
2 Division of Infectious Diseases, Department of Medicine, National University Hospital, Singapore, Infectious Diseases Translational Research Programme, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore; Singapore, Institute for Health Innovation and Technology (iHealthtech), National University of Singapore; Singapore.
3 Clinical Epidemiology and Medical Statistics Unit, Department of Medicine, Surgery and Pharmacy, University of Sassari, Sassari, Italy.