THE INCOMPETENT CERVICAL OS AND THE PESSARY.
D000026:Abortion, Habitual; D000028:Abortion, Induced; D000022:Abortion, Spontaneous; D002584:Cervix Uteri; D005260:Female; D006801:Humans; D010570:Pessaries; D011247:Pregnancy
ABORTION, HABITUAL; CERVIX UTERI; PESSARIES