Funding for this research was provided by:
European Union Regional Development Fund
Received: 14 February 2020
Accepted: 15 June 2020
First Online: 21 July 2020
Ethics approval and consent to participate
: The study protocol has been approved by the research ethics committee in each of the participating countries. In Germany by the local psychological ethical committee at University Medical Center Hamburg-Eppendorf (project-ID: LPEK-0088. In Poland by the Ethical Committee at Pomeranian Medical University in Szczecin (project-ID: KB-0012/162/19). In Denmark by The Regional Scientific Ethical Committees for Southern Denmark (project-ID: S-20190136). All participants are provided oral and written information about the study and sign written informed consent before enrollment in the study.The protocol is registered on Clinical Trials (ClinicalTrials.gov, XXX). No significant deviations from the protocol will be implemented without prior review and approval from the research ethics committee in each of the participating countries. Any amendment made to the protocol is to be submitted as an update of the Clinical Trials account.
: Not applicable.
: The authors declare that they have no competing interests.