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Ruiz-Canela M, de Irala-Estevez J, Martínez-González MA, Gómez-Gracia E, Fernández-Crehuet J.Ruiz-Canela M, et al.J Med Ethics. 2001 Jun;27(3):172-6. doi: 10.1136/jme.27.3.172.J Med Ethics. 2001.PMID: 11417024Free PMC article.Review.