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Verdurmen KM, Renckens J, van Laar JO, Oei SG.Verdurmen KM, et al. Among authors: oei sg.Obstet Gynecol Surv. 2013 Dec;68(12):811-24. doi: 10.1097/OGX.0000000000000002.Obstet Gynecol Surv. 2013.PMID: 25102018Review.