Early embryonic loss: report of the study group.
D000026:Abortion, Habitual / Q000453:epidemiology / Q000209:etiology; D000022:Abortion, Spontaneous / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D005313:Fetal Death / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D011247:Pregnancy