1. Community Alcohol and Drug Service and Christchurch Opioid Recovery Service, Canterbury District Health Board, Hillmorton Hospital, Christchurch, New Zealand
2. Psychiatric Consultation Service and Older Persons Mental Health Service, Canterbury District Health Board, Christchurch, New Zealand
3. Department of Psychological Medicine, University of Otago, Christchurch and Psychiatric Services for Adults with an Intellectual Disability (PSAID), Canterbury District Health Board, Christchurch, New Zealand