Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01KQ1002B)
Received: 12 February 2020
Accepted: 20 August 2020
First Online: 28 August 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Hamburg Chamber of Psychotherapists. The study was conducted according to the principles of the Declaration of Helsinki (2013 version). Written informed consent was obtained from all participants before inclusion into the study.
: Not applicable.
: Christian Brettschneider is an Associate Editor of BMC Psychiatry. All other authors declare that there are no competing interests.