[1] Univ Bern, Univ Hosp Child & Adolescent Psychiat & Psychother, Bolligenstr 111, CH-3000 Bern 60, Switzerland
[2] Heidelberg Univ, Ctr Psychosocial Med, Dept Child & Adolescent Psychiat, Heidelberg, Germany
[3] Heidelberg Univ, Ctr Psychosocial Med, Ctr Psychotherapy Res, Heidelberg, Germany
[4] Univ Leipzig, Med Fac, Dept Psychiat & Psychotherapy, Leipzig, Germany
[5] Univ Marburg, Fac Med, Dept Child & Adolescent Psychiat, Psychosomat & Psychotherapy, Marburg, Germany
[6] Univ Cologne, Univ Hosp Cologne, Fac Med, Dept Child & Adolescent Psychiat Psychosomat & Psy, Cologne, Germany
[7] Univ Hosp Hamburg Eppendorf, German Ctr Addict Res Childhood & Adolescence, Hamburg, Germany
[8] Univ Educ Schwab Gmund, Dept Educ Psychol & Hlth Psychol, Schwabisch Gmund, Germany