Does early administration of epidural analgesia affect obstetric outcome in nulliparous women who are in spontaneous labor?
Chestnut DH, McGrath JM, Vincent RD, Penning DH, Choi WW, Bates JN, McFarlane C. Does early administration of epidural analgesia affect obstetric outcome in nulliparous women who are in spontaneous labor? Anesthesiology. 1994 Jun; 80(6):1201-8.