TY - GEN AU - Spencer,Kevin AU - de Kok,J B AU - Swinkels,D W TI - Increased total cell-free DNA in the serum of pregnant women carrying a fetus affected by trisomy 21 SN - 0197-3851 PY - 2003///1204 KW - Adolescent KW - Adult KW - Biomarkers KW - blood KW - DNA KW - Down Syndrome KW - Female KW - Fetus KW - cytology KW - Humans KW - Male KW - Polymerase Chain Reaction KW - Pregnancy KW - Pregnancy Trimester, Second KW - Prenatal Diagnosis N1 - Publication Type: Journal Article UR - https://doi.org/10.1002/pd.647 ER -