1. Lecturer in Sociology and Communications, School of Social Sciences, Brunel UniversityMiddlesex UB8 3PH, UK
2. Consultant in Public Health, Department of Primary Care and Social Medicine, Imperial College Faculty of MedicineLondon W6 8RP, UK
3. Senior Lecturer in Sociology, Public Health and Policy Unit, London School of Hygiene and Tropical MedicineKeppel Street, London W1, UK