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Article History

Received: 7 July 2025

Accepted: 26 February 2026

First Online: 5 March 2026

Declarations

:

: Greece: The study was approved by the Bioethics Committee of Harokopio University (date of approval: 12th of March 2021; reference number: 953/10–3-2021).The Netherlands: The Medical Research Ethics Committee of the Erasmus Medical Centre, Rotterdam, The Netherlands decided that the regulations from the Dutch Medical Research Involving Human Subjects Act (Dutch abbreviation WMO) do not apply to this research protocol. Therefore permission was granted by the committee for the execution of this study and for publications in a later stage of the study (date of approval: 9th of June 2021; reference number: MEC-2021–0396).Spain: The Drug Research Ethics Committee (CEIm) of the Pere Virgili Health Research Institute (Reus, Spain) granted the permission for executing this study and for publications in a later stage of the study (date of approval: 7th June 2021 and date of amendment: 28th of October 2021; reference number: 085/2021).The UK: The study has been approved by the Sport and Health Sciences Ethics Committee of University of Exeter, (date of approval: 26th of May 2021 (stage 1) and 27th of October 2021 (stage 2); reference numbers (21–03-24-B-02, 21–07-14-B-04).All participants and their parents completed an informed consent form before participating in the study.

: All participants and their parents completed an informed consent form before participating in the study.

: The authors declare no competing interests.