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Longer time-to-pregnancy in spontaneously conceived pregnancies is associated with lower PAPP-A and free β-hCG in first trimester screening for Down syndrome |
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| Authors: | I Kirkegaard N Uldbjerg A Tabor T B Henriksen |
| Institution: | 1. Department of Obstetrics and Gynecology, Aarhus University Hospital, Aarhus, Denmark;2. Center of Fetal Medicine, Rigshospitalet–Copenhagen University Hospital, Copenhagen, Denmark
Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark;3. Department of Pediatrics, Aarhus University Hospital, Aarhus, Denmark |
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