1. Section of Sport Medicine & Biology of Exercise, School of Physical Education and Sports Science, National and Kapodistrian University of Athens, 41 Ethnikis Antistasis, 17237 Daphne, Greece
2. Department of Sports Organization and Management, Faculty of Human Movement and Quality of Life Sciences, University of Peloponnese, Efstathiou and Stamatikis Valioti & Plataion Avenue, 23100 Sparta, Greece
3. School of Philosophy and Education, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
4. Arsakeia-Tositseia Schools, Philekpaideftiki Etaireia, Mitilinis 26, 11256 Athens, Greece
5. Faculty of Sport Sciences & Physical Education, Metropolitan College, Eleftheriou Venizelou 14, 54624 Thessaloniki, Greece