Peñarrieta de Córdova, M. I.; Mercado Curi, E. J.; Piñones Martínez, S.; Gutiérrez Gómez, T.; del Ángel, B. FACTORS THAT TAKE PART IN THE USAGE OF THE HEALTH SERVICES FROM SENIOR ADULTS. Invest. Educ. Enferm. 2008, 24.