1 Division of Gastroenterology and Hepatology, Temple University Hospital, Philadelphia, Pennsylvania.
2 Clinical Effectiveness Research Group, Institute of Health and Society, University of Oslo; Section for Gastroenterology, Department of Transplantation Medicine, Oslo University Hospital, Oslo, Norway; Digestive Disease Center, Showa University Northern Yokohama Hospital, Yokohama, Japan. Electronic address: ibusiginjp@gmail.com.