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Clark TJ, Mann CH, Shah N, Khan KS, Song F, Gupta JK.Clark TJ, et al. Among authors: khan ks.Acta Obstet Gynecol Scand. 2001 Sep;80(9):784-93. doi: 10.1034/j.1600-0412.2001.080009784.x.Acta Obstet Gynecol Scand. 2001.PMID: 11531627Free article.Review.