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17. Screening for Down's syndrome: effects, safety, and cost effectiveness of first and second trimester strategies. Gilbert RE; Augood C; Gupta R; Ades AE; Logan S; Sculpher M; van Der Meulen JH BMJ; 2001 Aug; 323(7310):423-5. PubMed ID: 11520837 [TBL] [Abstract][Full Text] [Related]
18. Pre-natal screening for Down's syndrome. Phillips A; Wakeman A J Public Health Med; 1994 Mar; 16(1):114-5; author reply 116-7. PubMed ID: 8080557 [No Abstract] [Full Text] [Related]