When risk factors have little meaning.
Bingham
P
P
D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D003376:Counseling / Q000379:methods; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis