Winnette R, Zárate V, Machnicki G, DeMuro-Mercon C, Gawlicki M, Gnanasakthy A. Patient-reported outcomes in Latin America: implementation in research and role in emerging HTA systems. Value in Health Regional Issues. 2015 Dec;8:49-55. doi: 10.1016/j.vhri.2015.03.008
Ervin CM, Mangel AW. Clinical trials in irritable bowel syndrome: a review. Rev Recent Clin Trials. 2013 Mar 1;8(1):9-22.