[1] Univ Queensland, Sch Populat Hlth, Discipline Epidemiol & Biostat, Brisbane, Qld, Australia
[2] Univ New S Wales, Sch Publ Hlth & Community Med, Sydney, NSW, Australia
[3] Univ Newcastle, Fac Hlth, Callaghan, NSW 2308, Australia
[4] Newcastle Mater Hosp, Dept Consultat Liaison Psychiat, Newcastle, NSW, Australia