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47. Maternal serum biochemistry at 11-13(+6) weeks in relation to the presence or absence of the fetal nasal bone on ultrasonography in chromosomally abnormal fetuses: an updated analysis of integrated ultrasound and biochemical screening. Cicero S, Spencer K, Avgidou K, Faiola S, Nicolaides KH. Prenat Diagn; 2005 Nov; 25(11):977-83. PubMed ID: 16245371 [Abstract] [Full Text] [Related]