1 Division of Gastroenterology and Hepatology, Oregon Health & Science University, Portland, Oregon, USA.
2 Department of Gastroenterology, Penn Medicine Princeton Medical Center, Plainsboro, New Jersey, USA.
3 GI Associates, Milwaukee, Wisconsin, USA.
4 Division of Gastroenterology, Montreal University Hospital Center (CHUM) and Montreal University Hospital Research Center (CRCHUM), Montreal, Quebec, Canada.
5 Division of Gastroenterology and Hepatology, Dell Medical School, University Texas at Austin, Austin, Texas, USA.
6 Division of Gastroenterology and Hepatology, Department of Gastroenterology, VA Medical Center, White River Junction, Vermont, USA; Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire, USA.
7 Division of Gastroenterology, Duke University Medical Center, Durham, North Carolina, USA.