1 Section of Digestive Diseases, Yale School of Medicine, New Haven, Connecticut.
2 Division of Gastroenterology, Duke University School of Medicine, Durham, North Carolina; Duke Clinical Research Institute, Durham, North Carolina.
3 Division of Gastroenterology and Hepatology, University of New Mexico School of Medicine, Albuquerque, New Mexico.
4 Karsh Division of Gastroenterology and Hepatology, Cedars-Sinai Medical Center, Los Angeles, California.
5 Vatche and Tamar Manoukian Division of Digestive Diseases, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California.
6 Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana; Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana.