Early vaginal bleeding, young maternal age, and preterm delivery.
Stevens-Simon
C
C
McAnarney
E R
ER
D000293:Adolescent; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014592:Uterine Hemorrhage / Q000209:etiology*