Randomized Controlled Trial
Validation of the PAC-SYM questionnaire for opioid-induced constipation in patients with chronic low back pain.
Eur J Pain. 2006 Apr 1;10(3):209-17.
Randomized Controlled Trial
Validation of the Bowel Function Index to detect clinically meaningful changes in opioid-induced constipation.
J Med Econ. 2009 Jan 1;12(4):371-83.
Randomized Controlled Trial
Fixed-ratio combination oxycodone/naloxone compared with oxycodone alone for the relief of opioid-induced constipation in moderate-to-severe noncancer pain.
Curr Med Res Opin. 2008 Dec 1; 24 (12): 350335123503-12.