1. Patient-Reported Outcomes as Primary End Points in Clinical Trials of Inflammatory Bowel Disease 
Nicolas Williet, William J. Sandborn, Laurent Peyrin–Biroulet 
Clinical Gastroenterology and Hepatology 
Volume 12, Issue 8, Pages e6 (August 2014)
DOI: /j.cgh
Copyright © 2014 AGA Institute Terms and Conditions

2. Figure 1 FDA guidance for developing PROs.24
Clinical Gastroenterology and Hepatology  , e6DOI: ( /j.cgh )
Copyright © 2014 AGA Institute Terms and Conditions