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Ylikorkala O, Mäkilä UM.Ylikorkala O, et al. Among authors: makila um.Am J Obstet Gynecol. 1985 Jun 1;152(3):318-29. doi: 10.1016/s0002-9378(85)80221-0.Am J Obstet Gynecol. 1985.PMID: 3890549Review.