1 Central Clinical School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia. Electronic address: tompayne302@gmail.com.
2 Critical Care Program, The George Institute of Global Health, Sydney, NSW, Australia; Department of Intensive Care, Gosford Hospital, Gosford, NSW, Australia; Department of Anaesthesia and Pain Medicine, Gosford Hospital, Gosford, NSW, Australia; School of Medicine and Public Health, University of Newcastle, Callaghan, NSW, Australia.