Article History
Received: 6 January 2020
Accepted: 25 February 2020
First Online: 13 March 2020
Compliance with ethical standards
:
: None of the authors have funding, competing interests or affiliations to disclose.
: All authors are committed to upholding the ethical standards required by the Journal. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee of the German Sport University Cologne, Germany, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.