aCaboolture and The Prince Charles Hospitals, Metro North Hospital and Health Services, Brisbane, Queensland

bCritical Care Division, The George Institute for Global Health, Sydney, New South Wales

cJames Mayne Academy of Critical Care, The University of Queensland, St Lucia, Queensland

dRoyal North Shore Hospital, St Leonards, New South Wales

eWesley Hospital, Auchenflower, Queensland, Australia

Correspondence to Mahesh Ramanan, Level 2, ICU, Caboolture Hospital, 120 McKean Street, Caboolture, Queensland 4510, Australia. Tel: +61 7 5316 5956; e-mail: [email protected]; [email protected]