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Lete I, Doval JL, Pérez-Campos E, Sánchez-Borrego R, Correa M, de la Viuda E, Gómez MA, González JV, Lertxundi R, Martínez MT, Mendoza N, Robledo J.Lete I, et al.Contraception. 2007 Aug;76(2):77-83. doi: 10.1016/j.contraception.2007.04.014. Epub 2007 Jun 27.Contraception. 2007.PMID: 17656174