Review
A meta-analysis of upright positions in the second stage to reduce instrumental deliveries in women with epidural analgesia.
Acta Obstet Gynecol Scand. 2005 Aug 1;84(8):794-8.
Meta Analysis
Labor analgesia and cesarean delivery: an individual patient meta-analysis of nulliparous women.
Anesthesiology. 2004 Jan 1;100(1):142-8; discussion 6A.
Randomized Controlled Trial
A randomised double-blind comparison of epidural fentanyl versus fentanyl and bupivicaine for pain relief in the second stage of labour.
BJOG. 2004 Oct 1;111(10):1075-80.