Funding for this research was provided by:
Eberhard Karls Universität Tübingen
Article History
Received: 14 August 2019
Accepted: 15 October 2020
First Online: 26 November 2020
Compliance with ethical guidelines
:
: D. Murr, P. Larkin and O. Höner declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The ethics department of the Faculty of Economics and Social Sciences at the University of Tübingen and the youth academy of the professional soccer club approved the implementation of this study. All players and legal guardians (i.e., parents) provided informed consent prior to participation in the study.