[1] Princess Alexandra Hosp, Internal Med & Clin Epidemiol, 199 Ipswich Rd, Brisbane, Qld 4102, Australia
[2] Princess Alexandra Hosp, Med, 199 Ipswich Rd, Brisbane, Qld 4102, Australia
[3] Univ Queensland, Sch Clincial Med, Internal Med & Clin Epidemiol, Brisbane, Qld, Australia
[4] Univ Queensland, Sch Clincial Med, Med, Brisbane, Qld, Australia
[5] Eight Mile Plains Community Hlth, 51 McKechnie Dr, Eight Mile Plains, Qld 4113, Australia
[6] Griffith Sch Med, Sch Publ Hlth, Gold Coast, Qld, Australia