[1] Princess Alexandra Hosp, Dept Internal Med & Clin Epidemiol, Brisbane, Qld, Australia
[2] Princess Alexandra Hosp, Dept Geriatr Med, Brisbane, Qld, Australia
[3] Univ Queensland, Sch Clin Med, Brisbane, Qld, Australia
[4] Univ Queensland, Sch Clin Med, Princess Alexandra Southside Clin Unit, Brisbane, Qld, Australia
[5] Univ Queensland, Ctr Hlth Serv Res, Brisbane, Qld, Australia
[6] Royal Brisbane & Womens Hosp, Internal Med & Aged Care, Brisbane, Qld, Australia
[7] Royal Victorian Eye & Ear Hosp, Emergency Dept, Melbourne, Vic, Australia
[8] Univ Melbourne, Fac Med, Melbourne, Vic, Australia