Acuña Ávila, J.M., Murguía Cánovas, G. and López Fajardo, A.D. 2014. Biofeedback to decrease anxiety in football association players. Mexican Journal of Medical Research ICSA. 2, 4 (Jul. 2014). DOI:https://doi.org/10.29057/mjmr.v2i4.1809.