[1] Monash Univ, Dept Epidemiol & Prevent Med, Melbourne, Vic 3004, Australia
[2] Swansea Univ, Ctr Improvement Populat Hlth E Records Res, Swansea, W Glam, Wales
[3] Flinders Univ S Australia, Res Ctr Injury Studies, Adelaide, SA 5001, Australia
[4] Univ Washington, Dept Pediat, Seattle, WA 98195 USA
[5] Univ Washington, Dept Epidemiol, Seattle, WA 98195 USA
[6] Univ Auckland, Sect Epidemiol & Biostat, Sch Populat Hlth, Auckland 1, New Zealand
[7] Erasmus MC, Dept Publ Hlth, Rotterdam, Netherlands
[8] Univ Otago, Sch Med, Dept Prevent & Social Med, Injury Prevent Res Unit, Dunedin, New Zealand