Uterine bleeding during pregnancy. II. Factors relating to its incidence.
D000022:Abortion, Spontaneous; D000328:Adult; D001724:Birth Weight; D001789:Blood Group Antigens; D002140:California; D005006:Ethnicity; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008423:Maternal Age; D009929:Organ Size; D010298:Parity; D010920:Placenta / Q000033:anatomy & histology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology*; D012744:Sex Ratio; D013997:Time Factors; D014592:Uterine Hemorrhage / Q000453:epidemiology*
D001789:Blood Group Antigens