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 (Clinical Research Ed.), 2001, vol. 323, issue 7310, p 423, ISSN 09598138. ISBN 09598138.

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