Peña-Ordóñez, G. G.; Bustamante-Montes, L. P.; Ramírez-Duran, N.; Halley-Castillo, E.; García-Cáceres, L. Evaluation of Protein Intake and Physical Activity Associated With Sarcopenia in the Elderly. Rev Esp Nutr Hum Diet 2015, 20, 16-22.