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Trapp M, Kato K, Bohnet HG, Gerhard I, Weise HC, Leidenberger F.Trapp M, et al. Among authors: gerhard i.Am J Obstet Gynecol. 1986 Nov;155(5):1027-31. doi: 10.1016/0002-9378(86)90339-x.Am J Obstet Gynecol. 1986.PMID: 3777044
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