[1] Univ Heidelberg, Dept Addict Behav & Addict Med, Cent Inst Mental Hlth, D-68159 Mannheim, Germany
[2] Inst Sports Med, Berlin, Germany
[3] Univ Mainz, Dept Psychiat, D-6500 Mainz, Germany
[4] Charite Univ Med Berlin, Sect Clin Neurobiol, Dept Psychiat & Psychotherapy, Berlin, Germany
[5] Univ Munich, Dept Endocrinol, Med Klin Innenstadt, Munich, Germany