31 Department of Gastroenterology, New Tokyo Hospital, Gastroenterology, Matsudo, Chiba, Japan.30 Division of Population Medicine, School of Medicine, Cardiff University, Cardiff, United Kingdom.29 Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, United States David Geffen School of Medicine at UCLA, Department of Medicine, Los Angeles, California, United States.28 Sheffield Teaching Hospitals, Gastroenterology Department, Sheffield, United Kingdom.27 Division of Gastroenterology and Hepatology, Stanford University School of Medicine, VA Palo Alto, California, United States.26 Division of Gastroenterology and Hepatology, Internal Medicine Department, Faculty of Medicine, Gadjah Mada University, Sardjito General Hospital, Yogyakarta, Indonesia.25 Cochin Hospital, Gastroenterology Department, Paris, France.
24 University of British Columbia, Department of Medicine, Kelowna, Canada.