1. Division of Gastroenterology, Department of Internal Medicine, SoonChunHyang
University College of Medicine, Bucheon, Korea (the Republic of)
2. Division of Gastroenterology, Department of Internal Medicine, Hallym
University Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong,
Korea (the Republic of)
3. Division of Gastroenterology, Department of Internal Medicine, Seoul National
University College of Medicine, Seoul, Korea (the Republic of)
4. Department of Internal Medicine, Research Institute of Clinical Medicine of
Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University
Hospital, Jeonju, Korea (the Republic of)
5. Division of Gastroenterology, Department of Internal Medicine, School of
Medicine, Kyungpook National University, Daegu, Korea (the Republic of)
6. Division of Gastroenterology, Department of Internal Medicine, Yeungnam
University College of Medicine, Daegu, Korea (the Republic of)
7. Department of Internal Medicine, Hanyang University Guri Hospital, Hanyang
University College of Medicine, Guri, Korea (the Republic of)