Down's syndrome screening.
Haddow
J E
JE
Palomaki
G E
GE
D004314:Down Syndrome / Q000453:epidemiology / Q000517:prevention & control*; D005189:False Positive Reactions; D005260:Female; D005820:Genetic Testing; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal; D014481:United States / Q000453:epidemiology