G. Ashoor, A. Syngelaki, L. C. Y. Poon, J. C. Rezende and K. H. Nicolaides Fetal fraction in maternal plasma cell-free DNA at 11–13 weeks' gestation: relation to maternal and fetal characteristics Ultrasound in Obstetrics & Gynecology 41
Article first published online: 4 DEC 2012 | DOI: 10.1002/uog.12331
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