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First trimester screening for Down syndrome using free β hCG,total hCG and PAPP-A: an exploratory study |
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| Authors: | Dave Wright Kevin Spencer Barry Nix |
| Institution: | 1. University of Plymouth, Plymouth, UK;2. Clinical Biochemistry Department, King George Hospital, Goodmayes, UK;3. University of Cardiff, UK |
| Abstract: | |
| Keywords: | Down syndrome screening first trimester |