[1] Maastricht Univ, Ctr Med,EURON, S Limburg Mental Hlth Res & Teaching Network, Dept Psychiat & Neuropsychol, Maastricht, Netherlands
[2] Mondriaan Zorggroep, Div Addict Care, S Limburg, Netherlands
[3] Inst Psychiat, Div Psychol Med, London, England
[4] Max Planck Inst Psychiat, Clin Psychol & Epidemiol Unit, D-80804 Munich, Germany
[5] Tech Univ, Inst Clin Psychol & Psychotherapy, Dresden, Germany