First Trimester Screening for Birth Defects
American College of Obstetricians and Gynecologists
(2007, reaffirmed 2008). Screening for fetal chromosomal abnormalities. ACOG Practice Bulletin
No. 77. Obstetrics and Gynecology, 109(1): 217-227.
WebMD Medical Reference from Healthwise
May 06, 2010
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