Validity of hydration non-invasive indices during the weightcutting and official weigh-in for Olympic combat sports - Fernandez-Elias, V. E.; Martinez-Abellan, A.; Lopez-Gullon, J. M.; Moran-Navarro, R.; Pallares, J. P.; de la Cruz-Sanchez, E.; Mora-Rodriguez, R. (PLOS ONE, 2014)