Caffeine-containing energy drink improves physical performance of elite rugby players during a simulated match - Del Coso, J.; Ramirez, J. A.; Munoz, G.; Portillo, J.; Gonzalez-Millan, J.; Munoz, V.; Barbero-Alvarez, J. C.; Munoz-Guerra, J. (Applied Physiology, Nutrition, and Metabolism, 2013)