Jenny Iversen1, Vivian D Hope2, Jim McVeigh3. 1. Viral Hepatitis Epidemiology and Prevention Program, The Kirby Institute, UNSW Australia, Sydney, Australia. Electronic address: JIversen@kirby.unsw.edu.au. 2. Public Health England, Colindale Avenue, London, United Kingdom; Centre for Research on Drugs and Health Behaviour, London School of Hygiene & Tropical Medicine, United Kingdom. 3. Centre for Public Health, Liverpool John Moores University, Liverpool, United Kingdom.