aDiscipline of Acute Care Medicine, University of Adelaide, Adelaide

bThe Queen Elizabeth Hospital, Department of Intensive Care Medicine, Woodville South

cRoyal Adelaide Hospital, Adelaide, South Australia, Australia

dNuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK

Correspondence to James Malycha, MBBS, FCICM, Discipline of Acute Care Medicine, University of Adelaide, Adelaide, South Australia, Australia. Tel: +61 0 419 004 939; e-mail: [email protected]