Funding for this research was provided by:
Deutsche Rentenverischerung Rheinland (RFN11001)
Text and Data Mining valid from 2020-02-03
Received: 7 September 2019
Accepted: 22 December 2019
First Online: 3 February 2020
Ethics approval and consent to participate
: The study was conducted in compliance with the Helsinki Declaration and was approved by the Ethics Committee of the German Sport University Cologne (reference number: 56/12) and registered in the German Clinical Trials Register (ID: DRKS00004878). Written informed consent to participate in this study in the study was provided by all participants.
: Not applicable.
: The authors declare that there is no conflict of interests.