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Rei M, Ayres-de-Campos D, Bernardes J.Rei M, et al.Best Pract Res Clin Obstet Gynaecol. 2016 Jan;30:79-86. doi: 10.1016/j.bpobgyn.2015.04.011. Epub 2015 Jun 21.Best Pract Res Clin Obstet Gynaecol. 2016.PMID: 26148854Review.