1. Wonkwang Digestive Disease Research Institute, Wonkwang University, Iksan, Korea
2. Good Breath Clinic, Gunpo, Korea
3. Scientific Committee, Korean College of Helicobacter and Upper Gastrointestinal Research, Seoul, Korea
4. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
5. Department of Gastroenterology, Wonkwang University Sanbon Hospital, Gunpo, Korea
6. National Health Insurance Service, Wonju, Korea
7. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea