1 Infectious Disease Service, Department of Paediatrics, KK Women's and Children's Hospital, Singapore 229899, Singapore; Duke-NUS Medical School, Singapore; Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
2 Department of Paediatrics, National University of Singapore, Singapore; Khoo Teck Puat, National University Children's Medical Institute, National University Hospital, Singapore.
3 Children's Intensive Care Unit, KK Women's and Children's Hospital, Singapore; Duke-NUS Medical School, Singapore. Electronic address: lee.jan.hau@singhealth.com.sg.