Observations oon the site of the placenta and its effect on uterine contractions during labor.
D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D010920:Placenta; D011247:Pregnancy; D014590:Uterine Contraction; D014599:Uterus; D014937:Work
LABOR; PLACENTA; UTERUS