(1)
Xu, MS, Z.; Xie, MD, PhD, J.; Meng, MD, PhD, J.; Li, PhD, P.; Pan, MD, PhD, X.; Zhou, PhD, Q. Non-Invasive Prenatal Diagnosis: A Comparison of Cell Free Fetal DNA (cffDNA) Based Screening and Fetal Nucleated Red Blood Cell (fnRBC) Initiated Testing. N A J Med Sci 2013, 6.