Efficacy and safety of paracetamol for spinal pain and osteoarthritis: systematic review and meta-analysis of randomised placebo controlled trials
BMJ
Laparoscopic-assisted transversus abdominis plane block for postoperative pain control in laparoscopic ventral hernia repair: A randomized controlled trial
Journal of the American College of Surgeons
A randomized, placebo-controlled trial of lubiprostone for opioid-induced constipation in chronic noncancer pain
The American Journal of Gastroenterology
Evaluating efficacy and feasibility of transcutaneous electrical nerve stimulation for postoperative pain after video-assisted thoracoscopic surgery: a randomized pilot trial
Complementary Therapies in Clinical Practice