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3. First trimester Down's syndrome screening marker values and cigarette smoking: new data and a meta-analysis on free beta human chorionic gonadotophin, pregnancy-associated plasma protein-A and nuchal translucency. Bestwick JP; Huttly WJ; Wald NJ J Med Screen; 2008; 15(4):204-6. PubMed ID: 19106261 [TBL] [Abstract][Full Text] [Related]
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