1 Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore, Khoo Teck Puat-National University Children's Medical Institute.
2 Division of Infectious Diseases, University Medicine Cluster, National University Health System, Institute of Infectious Disease and Epidemiology, Communicable Disease Centre, Tan Tock Seng Hospital.
3 Department of Hematology-Oncology, National University Cancer Institute of Singapore, National University Health System Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
4 Institute of Infectious Disease and Epidemiology, Communicable Disease Centre, Tan Tock Seng Hospital, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
5 Division of Infectious Diseases, University Medicine Cluster, National University Health System, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.