Contingent screening for Down syndrome.
Summers
Anne M
AM
Huang
Tianhua
T
Meier
Chris
C
Farrell
Sandra A
SA
D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D012306:Risk