1 Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore; Australia and New Zealand Intensive Care Research Centre, School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia; Department of Anaesthesia, National University Hospital, National University Health System, Singapore. Electronic address: ryan.ling@u.nus.edu.
2 Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore; Cardiothoracic Intensive Care Unit, National University Hospital, National University Health System, Singapore.
3 Adult Intensive Care Services, The Prince Charles Hospital, Brisbane, QLD, Australia; Faculty of Health Sciences & Medicine, Bond University, Gold Coast, QLD, Australia; Faculty of Health, Queensland University of Technology, Brisbane, QLD, Australia; Faculty of Medicine, University of Queensland, Brisbane, QLD, Australia.