Funding for this research was provided by:
European Social Fund for Germany and the Sächsische Aufbaubank-Förderbank (SAB) of the Free State of Saxony (100310502, 100310502, 100310502, 100310502, 100310502)
Received: 31 October 2019
Accepted: 28 February 2020
First Online: 7 March 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Chemnitz University of Technology (TU Chemnitz), Faculty of Behavioral and Social Sciences, on December 19, 2017 – number <b>V-232-17-KM-SENDA-07112017</b>. The study was retrospectively registered with the German Clinical Trials Register on April 11, 2018 – number DRKS00013167. All study participants are fully informed about the study, have been deemed capable of ethically and medically consenting for their participation and give written informed consent for study participation and data analysis following the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.