Influence of placental weight on labor.
D000328:Adult; D001724:Birth Weight; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007743:Labor, Obstetric; D007744:Obstetric Labor Complications / Q000209:etiology; D009929:Organ Size; D010298:Parity; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy; D013997:Time Factors