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First-trimester maternal serum PAPP-A,SP1 and M-CSF levels in normal and trisomic twin pregnancies |
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| Authors: | N. A. Bersinger P. Noble K. H. Nicolaides |
| Affiliation: | 1. Department of Obstetrics and Gynaecology, University of Berne, Berne, Switzerland;2. Harris Birthright Research Centre for Fetal Medicine, King's College School of Medicine, Denmark Hill, London, England |
| Abstract: | |
| Keywords: | twin pregnancy first-trimester biochemical trisomy screening PAPP-A |