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Estimation of risk in second trimester serum screening for Down syndrome among women who have already had first trimester screening |
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| Authors: | Allan Hackshaw Nicholas Wald |
| Affiliation: | Wolfson Institute of Environmental and Preventive Medicine, Bortholorews and the London School of Medicine and Dentistry, Queen Mary's University of London, Charterhouse Square, London ECIM 6BQ |
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