Wilczyńska, D.
Łysak-Radomska, A.
Podczarska-Głowacka, M.
Krasowska, K.
Perzanowska, E.
Walentukiewicz, A.
Lipowski, M.
Skrobot, W.
Article History
Received: 13 July 2021
Accepted: 9 December 2021
First Online: 14 December 2021
Declarations
:
: Written informed consent from coaches and from parents or guardians of the children was a prerequisite to participate in the study, which was conducted in accordance with the Helsinki Declaration and approved by the AWFiS (Gdansk University of Physical Education and Sport) bioethics committee (project KB-13/17).
: Not applicable.
: The authors declare that they have no competing interests.