1Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
2Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
3Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
4Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Guri, Korea
5Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
6Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
7Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea
8Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea
9National Evidence-based Healthcare Collaborating Agency, Seoul, Korea.
10Department of Gastroenterology, Dongguk University Ilsan Hospital, Goyang, KoreaKorean College of Helicobacter and Upper Gastrointestinal Research–Metabolism, Obesity
11Division of Gastroenterology, Department of Internal Medicine, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, KoreaKorean Society of Gastrointestinal Endoscopy–The Research Group for Endoscopes and Devices, Seoul, Korea
12Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
13Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
14Department of Internal Medicine, Pusan National University College of Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea
15Division of Gastroenterology, Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
16Division of Gastroenterology, Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea
17Department of Internal Medicine, Hanyang University School of Medicine, Seoul, Korea