1. Department of Internal Medicine and Wonkwang Digestive Disease Research Institute, Wonkwang University Sanbon Hospital, Wonkwang University College of Medicine, Gunpo, Korea.
2. Department of Medical Record, Wonkwang University Sanbon Hospital, Wonkwang University College of Medicine, Gunpo, Korea.
3. Big Data Steering Department, National Health Insurance Service, Wonju, Korea.
4. Scientific Committee of the Korean College of Helicobacter and Upper Gastrointestinal Research, Seoul, Korea.
5. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.