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Barnhart K, Esposito M, Coutifaris C.Barnhart K, et al.Obstet Gynecol Clin North Am. 2000 Sep;27(3):653-67, viii. doi: 10.1016/s0889-8545(05)70162-5.Obstet Gynecol Clin North Am. 2000.PMID: 10958010Free article.Review.