1. Drug and Alcohol Services, South Eastern Sydney Local Health District, Sydney, NSW, Australia
2. Department of Psychology, Macquarie University, North Ryde, NSW, Australia
3. School of Psychiatry, Faculty of Medicine, UNSW Australia, NSW, Sydney, Australia
4. Academic Department for Old Age Psychiatry, Prince of Wales Hospital, Randwick, NSW, Australia
5. School of Public Health & Community Medicine, Faculty of Medicine, UNSW Australia, Sydney, NSW, Australia
6. Discipline of Addiction Medicine, Central Clinical School, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia