Funding for this research was provided by:
Grantová Agentura České Republiky (18-24977S, 18-24977S)
Ministerstvo Školství, Mládeže a Tělovýchovy (LTT18020, LTT18020)
Received: 5 December 2021
Accepted: 4 May 2022
First Online: 12 May 2022
: The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of the Faculty of Physical Culture Palacký University Olomouc (protocol code 7/2017; date of approval 12/1/2017). Parents were informed about the study by informed consent to child participation in the survey. Participation in the study was voluntary and anonymous, with no explicit incentives provided for participation.
: Not applicable.
: None of the authors has any conflict to declare.