The labor curve.
D002584:Cervix Uteri / Q000502:physiology* / Q000503:physiopathology; D004420:Dystocia / Q000503:physiopathology; D005260:Female; D006801:Humans; D007747:Labor Stage, First; D007743:Labor, Obstetric; D011247:Pregnancy; D013997:Time Factors; D014590:Uterine Contraction