1 Department for Child and Adolescent Psychiatry and Psychotherapy, University Medical Center Ulm, Ulm, Germany. Joerg.Fegert@uniklinik-ulm.de.
2 Competence Area Mental Health Prevention in the Competence Network Preventive Medicine Baden-W?rttemberg, Ulm, Germany. Joerg.Fegert@uniklinik-ulm.de.
3 Federal Institute for Population Research (BiB), Wiesbaden, Germany.
4 Department for Child and Adolescent Psychiatry and Psychotherapy, University Medical Center Ulm, Ulm, Germany. Andreas.Witt@upd.ch.
5 University Psychiatric Services Bern (UPD), Bern, Switzerland. Andreas.Witt@upd.ch.
6 Institute of Medical Psychology, Medical Faculty, University Heidelberg, Heidelberg, Germany.