[1] Alfred Hosp, Emergency & Trauma Ctr, Melbourne, Vic, Australia
[2] Alfred Hosp, Natl Trauma Res Inst, Melbourne, Vic, Australia
[3] Monash Univ, Dept Community Emergency Hlth & Paramed Practice, Melbourne, Vic, Australia
[4] Victoria Univ, Coll Hlth & Biomed, Melbourne, Vic, Australia
[5] Monash Univ, Dept Epidemiol & Prevent Med, Melbourne, Vic, Australia