title: Station at onset of active phase in nulliparous patients and risk of cesarean delivery.
authors.forename: E A
authors.initials: EA
authors.lastname: Friedman
mesh_terms: D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007747:Labor Stage, First; D010298:Parity; D011247:Pregnancy; D012307:Risk Factors