BMed (Hons) FRACGP, FAChAM, MMH, General Practitioner, Alice St General Practice, Newtown, NSW; Staff Specialist in Addiction, Drug and Alcohol Services, South Eastern Sydney Local Health District, Caringbah, NSW; Conjoint Lecturer, School of Population Health, University of NSW, Kensington, NSW; Centre for Primary Health Care and Equity (CPHCE), University of New South Wales, Kensington, NSW