[1] Sunshine Hosp, Dept Emergency Med, Melbourne, Vic, Australia
[2] Univ Melbourne, Fac Med Dent & Hlth Sci, Dept Paediat, Melbourne, Vic, Australia
[3] Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[4] Paediat Res Emergency Dept Int Collaborat PREDICT, Melbourne, Vic, Australia
[5] Womens & Childrens Hosp, Dept Emergency Med, Adelaide, SA, Australia