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Picone O, Vauloup-Fellous C, Cordier AG, Parent Du Châtelet I, Senat MV, Frydman R, Grangeot-Keros L.Picone O, et al.BJOG. 2009 May;116(6):818-23. doi: 10.1111/j.1471-0528.2009.02139.x.BJOG. 2009.PMID: 19432571