[1] Univ New S Wales, Sch Psychiat, Sydney, NSW 2052, Australia
[2] Univ New S Wales, Sch Publ Hlth & Community Med, Sydney, NSW 2052, Australia
[3] Royal N Shore Hosp, Dept Aged Care & Rehabil, Sydney, NSW, Australia
[4] James Fletcher Hosp, Hunter Mental Hlth Serv, Sydney, NSW, Australia
[5] Univ New S Wales, Sch Publ Hlth & Community Med, Sydney, NSW 2052, Australia
[6] Prince Wales Hosp, Dept Aged Care Psychiat, Sydney, NSW, Australia
[7] Univ Sydney, Dept Psychol Med, Sydney, NSW 2006, Australia
[8] Univ New S Wales, Sch Community Med, Sydney, NSW 2052, Australia
[9] Univ New S Wales, Sch Psychiat, Sydney, NSW 2052, Australia