1. Department of GastroenterologyAsan Medical CenterUniversity of Ulsan College of Medicine Seoul Korea
2. Department of Internal MedicineHallym University College of Medicine Chuncheon Korea
3. Department of Internal MedicineGangneung Asan HospitalUniversity of Ulsan College of Medicine Gangneung Korea
4. Department of Internal MedicineUijongbu St. Mary's HospitalThe Catholic University of Korea Uijongbu Korea
5. Department of Internal MedicineIncheon St. Mary's HospitalCollege of MedicineThe Catholic University of Korea Incheon Korea
6. Department of Internal MedicineSoonchunhyang University College of Medicine Bucheon Korea
7. Department of Internal MedicineHallym University College of Medicine Anyang Korea
8. Department of Internal MedicineSeoul National University Bundang Hospital Seongnam Korea
9. Department of Internal MedicineYeungnam University College of Medicine Daegu Korea
10. Department of Internal Medicine School of Medicine Kyungpook National UniversityDaeguKorea
11. Department of Internal MedicineInje University College of Medicine Busan Korea
12. Department of Internal MedicinePusan National University Yangsan Hospital Yangsan Korea
13. Department of Internal MedicineCollege of MedicineEwha Womans University Seoul Korea
14. Department of Internal MedicineGangnam Severance HospitalYonsei University College of Medicine Seoul Korea
15. Department of Internal Medicine and Digestive Disease Research InstituteWonkwang University School of Medicine Iksan Korea
16. Department of Internal MedicinePresbyterian Medical Center Jeonju Korea
17. Department of Internal MedicineChonnam National University Medical School Gwangju Korea
18. Department of Internal MedicineJeju National University School of Medicine Jeju Korea
19. Department of Internal MedicineChungnam National University School of Medicine Daejeon Korea
20. Department of Internal MedicineKonyang University College of Medicine Daejeon Korea
21. Department of Internal MedicineGachon Graduated School of MedicineGil Medical Center Incheon Korea
22. Department of Clinical Epidemiology and BiostatisticsAsan Medical CenterUniversity of Ulsan College of Medicine Seoul Korea