1 Division of Gastroenterology, Beth Israel Deaconess Medical Center, Boston, Massachusetts. Electronic address: ssheth@bidmc.harvard.edu.
2 Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana; Richard L. Roudebush VA Medical Center, Indianapolis, Indiana; Regenstrief Institute, Inc, Indianapolis, Indiana.
3 Division of Gastroenterology, Weill Cornell Medical College, New York, New York.
4 Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
5 Division of Gastroenterology & Hepatology, University of Virginia School of Medicine, Charlottesville, Virginia.
6 Division of Gastroenterology and Duke Clinical Research Institute, Duke University School of Medicine, Durham, North Carolina.