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8. Integrated ultrasound and biochemical screening for trisomy 21 using fetal nuchal translucency, absent fetal nasal bone, free beta-hCG and PAPP-A at 11 to 14 weeks. Cicero S; Bindra R; Rembouskos G; Spencer K; Nicolaides KH Prenat Diagn; 2003 Apr; 23(4):306-10. PubMed ID: 12673635 [TBL] [Abstract][Full Text] [Related]
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16. First trimester ultrasound tests alone or in combination with first trimester serum tests for Down's syndrome screening. Alldred SK; Takwoingi Y; Guo B; Pennant M; Deeks JJ; Neilson JP; Alfirevic Z Cochrane Database Syst Rev; 2017 Mar; 3(3):CD012600. PubMed ID: 28295158 [TBL] [Abstract][Full Text] [Related]
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