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An evaluation of the chorionic villus sampling learning curve.
Silver RK, MacGregor SN, Sholl JS, Hobart ED, Waldee JK. Silver RK, et al. Among authors: waldee jk. Am J Obstet Gynecol. 1990 Sep;163(3):917-22. doi: 10.1016/0002-9378(90)91096-u. Am J Obstet Gynecol. 1990. PMID: 2403168