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Van Le L, Ko E, Gehrig P, DiFurio M, Bae-Jump V, Rossi E.Van Le L, et al.Am J Obstet Gynecol. 2011 Jun;204(6):e1-3. doi: 10.1016/j.ajog.2011.04.013. Epub 2011 Apr 15.Am J Obstet Gynecol. 2011.PMID: 21752746