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Dose dependency between cigarette consumption and reduced maternal serum PAPP-A levels at 11–13+6 weeks of gestation |
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| Authors: | K O Kagan V Frisova K H Nicolaides K Spencer |
| Institution: | Harris Birthright Research Centre for Fetal Medicine, King's College Hospital Medical School, London, UK |
| Abstract: | |
| Keywords: | screening maternal serum biochemistry PAPP-A smoking trisomy free β-hCG |