[Legal abortion and villous residua--with reference to the prevention of its complications].
D000029:Abortion, Legal; D000032:Abortion, Therapeutic; D005321:Extraembryonic Membranes / Q000473:pathology*; D005260:Female; D011247:Pregnancy; D014591:Uterine Diseases / Q000209:etiology / Q000517:prevention & control*