1. Department of Physical Education and Sport, University of the Basque Country, UPV/EHU , Vitoria-Gasteiz , Spain
2. Osasunkirol, Salud y Deporte , Hondarribia , Spain
3. Clinical Epidemiology Unit, Hospital Universitario Donostia . Donostia-San Sebastián , Spain
4. Football Training and Biomechanics Laboratory, Italian Football Federation (FIGC), Technical Department , Coverciano (Florence), Italy
5. Club Atlético Osasuna , Pamplona , Spain