The effects of sildenafil on rectal sensitivity and tone in patients with the irritable bowel syndrome - Medeiros, M. T. Gonçalves de; Oliveira, Ricardo Brandt de; Santos, A. A. dos; Leopoldino, D. M. de; Lima, M. C. Oliveira; Nobre, R. Arrais; Souza, M. A. Nobre e (Alimentary Pharmacology and Therapeutics, 2012)