- Alberto Mendez-Villanueva, Facultad de Ciencias de la Actividad Física y el Deporte, Universidad de Alcalá, Campus Universitário, Ctra. Madrid-Barcelona Km. 3,600, 28871 Alcalá de Henares (Madrid), Spain;
- Accepted June 24, 2007
- First published October 23, 2007.
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