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Lack of standardization in determining gestational age for prenatal screening.
Koster MP, Van Leeuwen-Spruijt M, Wortelboer EJ, Stoutenbeek P, Elvers LH, Loeber JG, Visser GH, Schielen PC. Koster MP, et al. Among authors: van leeuwen spruijt m. Ultrasound Obstet Gynecol. 2008 Oct;32(5):607-11. doi: 10.1002/uog.5347. Ultrasound Obstet Gynecol. 2008. PMID: 18720453 Free article.