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Authors
Ficek, Krzysztof https://orcid.org/0000-0002-3027-9984
Rajca, Jolanta
Cholewiński, Jerzy
Racut, Agnieszka
Gwiazdoń, Paweł
Przednowek, Krzysztof
Hajduk, Grzegorz
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Article History
Received: 15 June 2021
Accepted: 31 August 2021
First Online: 8 September 2021
Declarations
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: The study was performed according to the Declaration of Helsinki. The study protocol was approved by the Research Ethics Committee of the Jerzy Kukuczka Academy of Physical Education (Reference Number: 2/2011). Due to the retrospective nature of the study, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.
