Ai, Lixin , College of Sports Science, Tianjin Normal University, Tianjin 300387, China
Alves, Ricardo , Faculty of Sport Sciences and Physical Education, University of Coimbra, 3040-248 Coimbra, Portugal
Armatas, Vasilis , School of Physical Education and Sport Science, National and Kapodistrian University of Athens, 15772 Athens, Greece

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