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22. First-trimester Down syndrome screening using additional serum markers with and without nuchal translucency and cell-free DNA. Johnson J; Pastuck M; Metcalfe A; Connors G; Krause R; Wilson D; Cuckle H Prenat Diagn; 2013 Nov; 33(11):1044-9. PubMed ID: 23836291 [TBL] [Abstract][Full Text] [Related]
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