[1] Heidelberg Univ, Cent Inst Mental Hlth, Dept Addict Behav & Addict Med, D-68159 Mannheim, Germany
[2] Univ Tubingen, Teaching Hosp, Kliniken Landkreis Sigmaringen GMBH, Dept Psychiat & Psychotherapy, Tubingen, Germany
[3] Charite Univ Med Berlin, Dept Psychiat & Psychotherapy, Berlin, Germany
[4] Heidelberg Univ, Dept Clin & Cognit Neurosci, Cent Inst Mental Hlth, D-6900 Heidelberg, Germany