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Maier JA, Bergman A, Ross MG.Maier JA, et al. Among authors: ross mg.Am J Obstet Gynecol. 1986 Oct;155(4):756-8. doi: 10.1016/s0002-9378(86)80014-x.Am J Obstet Gynecol. 1986.PMID: 3766631
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