**Author details**

Javier Vilamitjana<sup>1</sup> \*, Julio Calleja-Gonzalez<sup>2</sup> and Diego Marqués-Jiménez<sup>3</sup>

1 Soccer Research Group, Friends Club – CDA, Buenos Aires, Argentina

2 Department of Physical Education and Sports, Faculty of Education and Sport, University of the Basque Country, UPV/EHU, Vitoria-Gasteiz, Spain

3 Faculty of Education, University of Valladolid, Soria, Spain

\*Address all correspondence to: vilamitjana@yahoo.com

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