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Kuppermann M, Norton ME, Gates E, Gregorich SE, Learman LA, Nakagawa S, Feldstein VA, Lewis J, Washington AE, Nease RF Jr.Kuppermann M, et al. Among authors: washington ae.Obstet Gynecol. 2009 Jan;113(1):53-63. doi: 10.1097/AOG.0b013e31818e7ec4.Obstet Gynecol. 2009.PMID: 19104360Clinical Trial.