1 Emeritus Researcher. GRAC (Grup Recerca Addiccions Clínic). IDIBAPS. Hospital Clínic, Barcelona, Spain; Past President of EUFAS (European Federation of Addiction Societies), EU. Electronic address: tgual@clinic.cat.
2 Professor of Addiction Psychiatry. Addictions Department. National Addiction Centre. Institute of Psychiatry, Psychology and Neuroscience. King's College London. 4 Windsor Walk. London SE5 8AF U.K.; President of EUFAS (European Federation of Addiction Societies), EU.