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4. [Prenatal screening for Down's syndrome]. Qin Q; Christiansen M; Norgaard-Pedersen B Zhonghua Fu Chan Ke Za Zhi; 1997 Nov; 32(11):694-7. PubMed ID: 9639772 [No Abstract] [Full Text] [Related]
6. Measurement of choriogonadotropin free beta-subunit: an alternative to choriogonadotropin in screening for fetal Down's syndrome? Knight GJ; Cole LA Clin Chem; 1991 Jun; 37(6):779-82. PubMed ID: 1828723 [No Abstract] [Full Text] [Related]
7. Antenatal screening for Down's syndrome. Macri VJ; Clark R BMJ; 1992 Sep; 305(6856):768; author reply 771. PubMed ID: 1422338 [No Abstract] [Full Text] [Related]