Funding for this research was provided by:
Bundesinstitut für Sportwissenschaft (070117/09)
Albert-Ludwigs-Universität Freiburg im Breisgau
Article History
Received: 25 October 2020
Accepted: 17 February 2021
First Online: 5 March 2021
Ethics approval and consent to participate
: The ‘Ethik-Kommission bei der Landesärztekammer Hessen’ approved the study (Reference Number = FF 33/2009). Written informed consent for participation in the study was obtained from participants, or where participants were children (under 16 years old) from their parent or guardian.
: Not applicable.
: The authors declare no competing interests.