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Ruiz Palacio A, Pastor Villalba E, Martín Ivorra R, Alguacil Ramos AM, Portero Alonso A, Lluch Rodrigo JA.Ruiz Palacio A, et al. Among authors: martin ivorra r.Rev Esp Salud Publica. 2011 Jun;85(3):285-95. doi: 10.1590/S1135-57272011000300007.Rev Esp Salud Publica. 2011.PMID: 21892553Free article.Spanish.