aFaculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia bNew South Wales Ambulance, Sydney, NSW, Australia cNorthern Beaches Hospital, Sydney, NSW, Australia dNational Health and Medical Research Council Clinical Trials Centre, University of Sydney, Sydney, NSW, Australia eSt Vincent's Hospital, Sydney, NSW, Australia fUniversity of New South Wales, Sydney, NSW, Australia gWestmead Hospital, Sydney, NSW, Australia hRoyal Prince Alfred Hospital, Sydney, NSW, Australia...