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5. Serum markers for Down's syndrome in relation to number of previous births and maternal age. Wald NJ, Watt HC. Prenat Diagn; 1996 Aug; 16(8):699-703. PubMed ID: 8878278 [Abstract] [Full Text] [Related]
6. [Evaluation of Down's syndrome screening methods using maternal serum biochemistry in the second trimester pregnancy]. Yu DY, Fu P, Zhang ZH, Wang F, Han MY, Ren HY, Zhao W, Zhang K, Li S, Jiang N. Zhonghua Yi Xue Yi Chuan Xue Za Zhi; 2011 Jun; 28(3):332-5. PubMed ID: 21644235 [Abstract] [Full Text] [Related]