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Morales Asencio JM, Bonill de Las Nieves C, Celdrán Mañas M, Morilla Herrera JC, Martín Santos FJ, Contreras Fernández E, San Alberto Giraldos M, Castilla Soto J.Morales Asencio JM, et al.Gac Sanit. 2007 Mar-Apr;21(2):106-13. doi: 10.1157/13101036.Gac Sanit. 2007.PMID: 17419926Free article.Spanish.