Screening for Down's syndrome: effects, safety, and cost effectiveness of first and second trimester strategies.
Gilbert, R E; Augood, C; Gupta, R; Ades, A E; Logan, S; Sculpher, M; van der Meulen, J H P; BMJ: British Medical Journal (International Edition), 2001, vol. 323, issue 7310, p 423, ISSN 09598146. ISBN 09598138.

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