[1] Monash Univ, Sch Publ Hlth & Prevent Med, St Kilda Rd, Clayton, Vic 3800, Australia
[2] Univ Auckland, Sch Populat Hlth, Auckland, New Zealand
[3] Flinders Univ S Australia, Res Ctr Injury Studies, Beford Pk, Adelaide, SA, Australia
[4] Royal Childrens Hosp, Trauma Serv, Melbourne, Vic, Australia
[5] Univ Melbourne, Dept Paediat, Melbourne, Vic, Australia
[6] Murdoch Childrens Res Inst, Surg Res Grp, Melbourne, Vic, Australia
[7] UCL, Dept Civil Environm & Geomat Engn, London, England