1. Viral Hepatitis Epidemiology and Prevention Program, The Kirby Institute, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia.
2. Program of International Research and Training, National Drug and Alcohol Research Centre, University of New South Wales Australia, Sydney, Australia.
3. Alcohol and Drug Service, St. Vincent's Hospital, Sydney, Australia.
4. Faculty of Medicine, University of New South Wales Australia, Sydney, Australia.