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Pérez Peñaranda A, García Ortiz L, Rodríguez Sánchez E, Losada Baltar A, Porras Santos N, Gómez Marcos MA.Pérez Peñaranda A, et al.Aten Primaria. 2009 Nov;41(11):621-8. doi: 10.1016/j.aprim.2009.03.005. Epub 2009 Jun 4.Aten Primaria. 2009.PMID: 19497641Free PMC article.Spanish.
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