[1] Eastern Hlth, Box Hill Hosp, Dept Intens Care, Box Hill, Vic, Australia
[2] Monash Univ, Australian & New Zealand Intens Care Res Ctr, Dept Epidemiol & Prevent Med, Melbourne, Vic, Australia
[3] Austin Hlth, Dept Intens Care, Heidelberg, Vic, Australia
[4] Canberra Hosp, Dept Anaesthesia & Pain Med, Canberra, Australia
[5] Nepean Hosp, Dept Anaesthesia & Pain Med, Sydney, NSW, Australia
[6] Peninsula Hlth, Dept Intens Care, Frankston, Vic, Australia
[7] North Canberra Hosp, Dept Intens Care, Canberra, Australia
[8] Univ Melbourne, Parkville, Vic, Australia
[9] Australian & New Zealand Intens Care Soc, Ctr Outcome & Resource Evaluat, Melbourne, Vic, Australia
[10] Alfred Hosp, Dept Intens Care, Melbourne, Vic, Australia
[11] Dandenong Hosp, Dept Intens Care, Dandenong, Vic, Australia
[12] Monash Univ, Peninsula Clin Sch, Frankston, Vic, Australia