Peyrin-Biroulet Laurent, Loftus Edward V, Colombel Jean-Frederic, Sandborn William J
Inflammatory Bowel Disease Clinic, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota 55905, USA.
Gut. 2010 Feb;59(2):141-7. doi: 10.1136/gut.2009.187120.