Louis Yi Ann Chai ⁎ 
Division of Infectious Diseases, University Medicine Cluster, National University Health System, NUHS Tower Block, 1E Kent Ridge Road, Singapore 119228
Department of Medicine, Radboud University Nijmegen Medical Centre, Nijmegen Institute for Infection, Inflammation and Immunity (N4i), Nijmegen, The Netherlands
Mary Rauff
Department of Obstetrics and Gynaecology, National University of Singapore, NUHS Tower Block, 1E Kent Ridge Road, Singapore 119228
Jeanne Shan Yin Ong
Division of Infectious Diseases, University Medicine Cluster, National University Health System, NUHS Tower Block, 1E Kent Ridge Road, Singapore 119228
Adrian Chin Leong Kee, Felicia Su Wei Teo
Division of Respiratory & Critical Care Medicine, University Medicine Cluster, National University Health System, NUHS Tower Block, 1E Kent Ridge Road, Singapore 119228