Screening performance for trisomy 21 comparing first trimester combined screening and a first trimester contingent screening protocol including ductus venosus and tricuspid flow |
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Authors: | Ekelund C K Petersen O B Sundberg K Pedersen F H Vogel I Tabor A |
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Affiliation: | Department of Fetal Medicine, Rigshospitalet, Copenhagen University Hospital, Denmark. charlotte.ekelund@gmail.com |
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