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Chambers SE, Geirsson RT, Stewart RJ, Wannapirak C, Muir BB. Audit of a screening service for fetal abnormalities using early ultrasound scanning and maternal serum alpha-fetoprotein estimation combined with selective detailed scanning. Ultrasound Obstet Gynecol. 1995 Mar;5(3):168–73. doi: 10.1046/j.1469-0705.1995.05030168.x. PMID: 7540492. |