[1] Natl Univ Singapore, Natl Univ Hlth Syst, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Monash Univ, Australia & New Zealand Intens Care Res Ctr, Sch Publ Hlth & Prevent Med, Melbourne, Vic, Australia
[3] Natl Univ Hlth Syst, Natl Univ Hosp, Dept Anaesthesia, Singapore, Singapore
[4] Natl Univ Hlth Syst, Natl Univ Hosp, Cardiothorac Intens Care Unit, Singapore, Singapore
[5] Prince Charles Hosp, Adult Intens Care Serv, Brisbane, Qld, Australia
[6] Bond Univ, Fac Hlth Sci & Med, Gold Coast, Qld, Australia
[7] Queensland Univ Technol, Fac Hlth, Brisbane, Qld, Australia
[8] Univ Queensland, Fac Med, Brisbane, Qld, Australia