1. School of Psychiatry and School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
2. School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
3. Concord and Rozelle Hospitals, Sydney, NSW, Australia
4. Department of Psychological Medicine, University of Sydney, NSW, Australia
5. School of Psychiatry, University of New South Wales, Sydney, Australia
6. Psychogeriatric Unit, Royal North Shore Hospital, Department of Aged Care and Rehabilitation, Sydney, NSW, Australia