Classic pages in Obstetrics and Gynecology. The graphic analysis of labor. Emanuel A. Friedman.
D002584:Cervix Uteri / Q000502:physiology; D005260:Female; D049673:History, 20th Century; D006801:Humans; D007743:Labor, Obstetric; D008991:Monitoring, Physiologic / Q000266:history; D009774:Obstetrics / Q000266:history*; D011247:Pregnancy; D014481:United States