[1] University Medicine Cluster,Division of Respiratory & Critical Care Medicine
[2] National University Health System,Department of Medicine, Yong Loo Lin School of Medicine
[3] National University of Singapore,Department of Medical Affairs
[4] National University Hospital,Division of Critical Care—Respiratory Therapy
[5] Yong Loo Lin School of Medicine,undefined
[6] National University of Singapore,undefined
[7] National University Hospital,undefined