Funding for this research was provided by:
German Federal Ministry of Education and Research (01EL1425A)
Received: 16 August 2019
Accepted: 3 February 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: The study was approved by the ethical committee of German Sport University Cologne (reference: 084/2017). All participants provided written informed consent.
: Not applicable.
: The authors declare no competing interest concerning this paper.