Safety of first-trimester chorionic villi sampling.
D002824:Chorionic Villi; D005260:Female; D005313:Fetal Death / Q000209:etiology*; D006801:Humans; D010920:Placenta; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis / Q000009:adverse effects*