1. Department of Big DATA Strategy, National Health Insurance Service, Wonju, Korea.
2. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
3. Institute for Digestive Research, Digestive Disease Center, Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Wonkwang University School of Medicine and Wonkwang University Hospital, Iksan, Korea.
5. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea.
6. Department of Internal Medicine, Catholic Kwandong University College of Medicine, St. International Mary’s Hospital, Incheon, Korea.
7. Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.