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Early first-trimester free β-hCG and PAPP-A serum distributions in monochorionic and dichorionic twins |
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| Authors: | I H Linskens M D Spreeuwenberg M A Blankenstein J M G van Vugt |
| Institution: | 1. Department of Obstetrics and Gynecology, VU University Medical Center Amsterdam, Amsterdam, The Netherlands;2. Department of Clinical Epidemiology and Biostatistics, VU University Medical Center Amsterdam, Amsterdam, The Netherlands;3. Department of Clinical Chemistry, VU University Medical Center Amsterdam, Amsterdam, The Netherlands |
| Abstract: | |
| Keywords: | twins chorionicity trisomy 21 PAPP-A free β-hCG |