[1] Queensland Ambulance Serv, High Acu Response Unit, Brisbane, Qld, Australia
[2] Royal North Shore Hosp, Emergency Dept, Sydney, NSW, Australia
[3] Alfred Hosp, Emergency & Trauma Ctr, Melbourne, Vic, Australia
[4] Wellington Reg Hosp, Emergency Dept, Wellington, New Zealand
[5] Austin Hlth, Emergency Dept, Melbourne, Vic, Australia