Evaluation of chorion villus sampling.
D000022:Abortion, Spontaneous / Q000209:etiology*; D000649:Amniocentesis; D015193:Chorionic Villi Sampling / Q000009:adverse effects* / Q000379:methods; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second