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Authors
Muehlbauer, Thomas http://orcid.org/0000-0001-7774-8664
Wagner, Vincent
Brueckner, Dennis
Schedler, Simon
Schwiertz, Gerrit
Kiss, Rainer
Hagen, Marco
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Article History
Received: 10 May 2019
Accepted: 22 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: Ethical permission was given by the Human Ethics Committee at the University of Duisburg-Essen, Faculty of Educational Sciences. Before the start of the study, participants’ assent and parents’ written informed consent were obtained prior to the start of the study.
: Not applicable.
: The authors declare that they have no competing interests. One of the authors, Professor Dr. Thomas Muehlbauer, is an Associate Editor of BMC Sports Science, Medicine, and Rehabilitation.
