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Krawczyk N, Banys-Paluchowski M, Schmidt D, Ulrich U, Fehm T.Krawczyk N, et al.Geburtshilfe Frauenheilkd. 2016 Feb;76(2):176-181. doi: 10.1055/s-0035-1558239.Geburtshilfe Frauenheilkd. 2016.PMID: 26941451Free PMC article.Review.