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Article History
Received: 11 February 2020
Accepted: 3 May 2020
First Online: 12 May 2020
Ethical approval and consent to participate
: After ethical approval (Swiss Federal Institute of Sport; Nr. 2018/057), all participants and their legal guardians signed written informed consent to participate. The study was conducted in accordance with the guidelines of the Declaration of Helsinki.
: Not applicable.
: There are no competing interests.
