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Authors
Reiss, Franziska
Erhart, Michael
Kaman, Anne
Devine, Janine
Zoellner, Fionna
Ravens-Sieberer, Ulrike
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Funding
Funding for this research was provided by:
Universitätsklinikum Hamburg-Eppendorf (UKE)
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Article History
Received: 10 April 2025
Accepted: 3 February 2026
First Online: 17 February 2026
Declarations
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: The BELLA study was approved by the Federal Commissioner for Data Protection and received a positive vote from the Ethics Committee of Hamburg’s Chamber of Psychotherapists (on 24 September 2014). The COPSY study was approved by the Local Psychological Ethics Committee (LPEK-0151) and the Commissioner for Data Protection of the University of Hamburg. This study is in compliance with the Declaration of Helsinki ( ). All participants and their parents were informed about the study procedures, data protection and voluntary participation. Informed consent was gathered from the parents of children under the age of 18 years and from adolescents aged at least 14 years.
: Not Applicable.
: The authors declare no competing interests.
