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Rodríguez Rodríguez N, Juncos-Rabadán O, Facal Mayo D.Rodríguez Rodríguez N, et al.Rev Esp Geriatr Gerontol. 2008 Sep-Oct;43(5):291-8. doi: 10.1016/s0211-139x(08)73571-6.Rev Esp Geriatr Gerontol. 2008.PMID: 18842203Free article.Spanish.