2 Alfred Health Emergency Services, Melbourne, Victoria, Australia; School of Public Health & Preventive Medicine, Monash University, Melbourne, Victoria, Australia.
3 Ambulance Victoria, Doncaster, Victoria, Australia; Department of Paramedicine, Monash University, Frankston, Victoria, Australia.
4 Ambulance Victoria, Doncaster, Victoria, Australia; Department of Intensive Care, Alfred Health, Melbourne, Victoria, Australia.