Physical strength and vitamin B12 in relation to cognitive score in Spanish institutionalized elderly - Albers, U.; Diaz, V.; Peinado, A.; Alvarez, M.; Sola, R.; Pietrzik, K.; Caballero, J.; Melendez, A.; Castillo, M. J.; Gonzalez-Gross, M.; (Annals Of Nutrition And Metabolism, 2007)