Randomized Controlled Trial
A comparison of bupivacaine-fentanyl-morphine with bupivacaine-fentanyl-diamorphine for caesarean section under spinal anaesthesia.
Int J Obstet Anesth. 2001 Jan 1;10(1):4-10.
Randomized Controlled Trial
The effects of sufentanil or morphine added to hyperbaric bupivacaine in spinal anaesthesia for caesarean section.
Eur J Anaesthesiol. 2006 Apr 1;23(4):285-91.
Randomized Controlled Trial
Combined spinal-epidural analgesia vs. intermittent bolus epidural analgesia for pain relief after major abdominal surgery. A prospective, randomised, double-blind clinical trial.
Int. J. Clin. Pract. 2008 Feb 1;62(2):255-62.