1. Division of Psychiatry (Formerly Mental Health Sciences), University College London, London, United Kingdom.
2. Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy.
3. School of Medicine, Medical and Biological Sciences Building North Haugh, University of St Andrews, St Andrews, United Kingdom.
4. Playfield Institute, Startheden Hospital, Cupar, United Kingdom.
5. LVR-Hospital Essen, Department of Addictive Behaviour and Addiction Medicine, Medical Faculty, University of Duisburg-Essen, Essen, Germany.