[Improve the quality of vaginal delivery].
Shan
J
J
D001720:Birth Injuries / Q000517:prevention & control; D036861:Delivery, Obstetric; D004420:Dystocia / Q000517:prevention & control*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011786:Quality Control; D014219:Trial of Labor