Vogt, Tobias http://orcid.org/0000-0002-0134-3916
Gassen, Simon
Wrede, Sören
Spielmann, Jan
Jedrusiak-Jung, Martin
Härtel, Sascha
Mayer, Jan
Article History
Received: 2 December 2017
Accepted: 20 March 2018
First Online: 23 April 2018
Compliance with ethical guidelines
:
: T. Vogt, S. Gassen, S. Wrede, J. Spielmann, M. Jedrusiak-Jung, S. Härtel and J. Mayer declare that they have no competing interests.
: All participants and their legal guardians provided written informed consent. The study was approved by the Human Research Ethics Committee of the German Sport University Cologne in compliance with the Declaration of Helsinki.