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Van Laar JO, Porath MM, Peters CH, Oei SG.Van Laar JO, et al. Among authors: peters ch.Acta Obstet Gynecol Scand. 2008;87(3):300-6. doi: 10.1080/00016340801898950.Acta Obstet Gynecol Scand. 2008.PMID: 18307069Free article.Review.