Basal serum cortisol and testosterone/cortisol ratio are related to rate of Na+ lost during exercise in elite soccer players - Castro-Sepulveda, M.; Cancino, J.; Fernández-Verdejo, R.; Pérez-Luco, C.; Jannas-Vela, S.; Ramirez-Campillo, R.; Del Coso, J.; Zbinden-Foncea, H. (International Journal of Sport Nutrition and Exercise Metabolism, 2019)