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Authors
Zając-Gawlak, Izabela https://orcid.org/0000-0002-7546-8199
Pelclová, Jana
Groffik, Dorota
Přidalová, Miroslava
Nawrat-Szołtysik, Agnieszka
Kroemeke, Aleksandra
Gába, Aleš
Sadowska-Krępa, Ewa
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Funding
Funding for this research was provided by:
Univerzita Palackého v Olomouci (18-16423S)
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Article History
Received: 31 August 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study was approved by the Ethics Commission at The Jerzy Kukuczka Academy of Physical Education (reference number. 3/2009). Moreover, an overarching longitudinal study in Central European countries was approved by the Institutional Research Ethics Committee, Faculty of Physical Culture, Palacký University Olomouc (reference number 20/2017). and was performed in accordance with the Declaration of Helsinki. All participants agreed in writing to participate in the study. The consent forms are in possession of the authors and can be made available upon request.
: Not applicable.
: The authors declare no competing interests.
