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Rao A, Celik E, Poggi S, Poon L, Nicolaides KH; Fetal Medicine Foundation Prolonged Pregnancy Group.Rao A, et al.Ultrasound Obstet Gynecol. 2008 Oct;32(5):646-51. doi: 10.1002/uog.6211.Ultrasound Obstet Gynecol. 2008.PMID: 18816476Free article.