[18 ring-like constrictions of the cervix uteri in pregnant subjects with threatened abortion or threatened prematurity].
D000028:Abortion, Induced; D000022:Abortion, Spontaneous; D000033:Abortion, Threatened; D002584:Cervix Uteri; D003250:Constriction; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D011247:Pregnancy; D011248:Pregnancy Complications
ABORTION, THREATENED; CERVIX UTERI; PREGNANCY COMPLICATIONS