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Rad M, Burggraaf J, de Kam ML, Cohen AF, Kluft C.Rad M, et al. Among authors: kluft c.Contraception. 2012 Sep;86(3):231-7. doi: 10.1016/j.contraception.2011.12.016. Epub 2012 Mar 23.Contraception. 2012.PMID: 22445437
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