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Utrera Torres MI, Medina López C, Vázquez Román S, Alonso Díaz C, Cruz-Rojo J, Fernández Cooke E, Pallás Alonso CR.Utrera Torres MI, et al.Int Breastfeed J. 2010 Mar 8;5:4. doi: 10.1186/1746-4358-5-4.Int Breastfeed J. 2010.PMID: 20211005Free PMC article.