[1] Monash Med Ctr, Dept Emergency Med, Melbourne, Vic, Australia
[2] Monash Univ, Sch Clin Sci Monash Hlth, Melbourne, Vic 3004, Australia
[3] Australasian Coll Emergency Med, Policy & Res, Melbourne, Vic, Australia
[4] Univ Melbourne, Melbourne Sch Populat & Global Hlth, Neuroepidemiol Unit, Melbourne, Vic, Australia
[5] Monash Univ, Dept Epidemiol & Prevent med, Melbourne, Vic 3004, Australia