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Additionally, it was approved by the local Ethics Committees of all participating centers: the Faculty of Medicine of the Ruhr-University Bochum (approval no. 15\u20135523), the Medical Faculty of the University of Cologne (approval no. 15\u2013335), the Medical Faculty of the University of W\u00fcrzburg (approval no. 254\/15_z), the Faculty of Medicine of the Eberhard Karls University T\u00fcbingen (approval no. 728\/2015BO2), the Medical Faculty of the University Aachen (approval no. EK 204\/17), the Medical Faculty of the University G\u00f6ttingen (approval no. 4\/3\/17), the Brandenburg Medical School Theodor Fontane (approval no. Z-01-20170208) and for the Central Institute of Mental Health Mannheim the Ethics Committee of the State Chamber of Medicine (Landes\u00e4rztekammer) Baden-W\u00fcrttemberg (approval no. B-F-2015-080).","order":1,"name":"Ethics","label":"Ethics Approval","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"All participating parents and preschool teachers provided written informed consent and participating children gave their assent for participation.","order":2,"name":"Ethics","label":"Consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The reporting of this study followed the CONSORT Guidelines (see Table\n                      \n                      in the Electronic Supplement).","order":3,"name":"Ethics","label":"Accordance with CONSORT guidelines","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"KB has received research grants from the German Research Foundation (DFG), German Federal Ministry of Education and Research (BMBF), Philipps-University Marburg, von Behring-R\u00f6ntgen Foundation, German Ministry for Health, University Hospital Gie\u00dfen and Marburg, and Rh\u00f6n Klinikum AG. She has received royalties from Georg Thieme Publisher during the last five years. CD has received royalties from Hogrefe as an author of self-help books for parents and teachers of preschool- and school-age children with ADHD. DB has served as an unpaid scientific advisor for an EU-funded neurofeedback trial. SH has received speaker\u2019s fees from Infectopharm\/Consilium. JG has received a research grant from the Bavarian State Ministry of Labour and Social Welfare, Family Affairs and Women (StMAS) and the Federal Ministry of Education and Research (BMBF). She receives royalties from Hogrefe for the publication of a treatment manual. TL has received funding from the BMBF and the Swiss Anorexia Nervosa Foundation for research projects, and royalties for textbooks and treatment manuals from Hogrefe, Kohlhammer, Springer and DeGrutyter. LP has received fees from Infectopharm, Medice, Shire \/ Takeda for scientific consulting, lecturing and as part of advisory boards in the last five years. She receives financial support (third-party funding) for research projects or direct funding of staff from the EU, the DFG, the FWF, and the BMBF. TB has served in an advisory or consultancy role for AGB pharma,eyelevel, Infectopharm, Medice, Neurim Pharmaceuticals, Oberberg GmbH and Takeda. He has received conference support or speaker\u2019s fees from Janssen-Cilag, Medice and Takeda. MD is a supervisor and lecturer and has received income as head of the School of Child and Adolescent Behavior Therapy at the University of Cologne and royalties from treatment manuals, books, and psychological tests published by Guilford, Hogrefe, Enke, Beltz, and Huber. He has received consulting income and research support from Medice, Shire and Medigital. All other authors declare no competing interests.","order":4,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}]}}