1. Department of Internal Medicine The Armed Forces Goyang Hospital Goyang‐si Korea
2. Department of Internal Medicine Kosin University College of MedicineKosin University Gospel Hospital Busan Korea
3. Department of Internal Medicine Ulsan University Asan Medical Center Seoul Korea
4. Department of Internal Medicine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University Hospital Pusan Korea
5. Division of Pulmonology, Allergy, and Critical Care Medicine Department of Internal Medicine Korea University Guro Hospital Seoul Korea
6. Department of Internal Medicine Chonnam National University Hwasun Hospital Hwasun Korea
7. Department of Internal Medicine Yonsei University Gangnam Severance Hospital Seoul Korea
8. Department of Internal Medicine Konkuk University Medical Center Seoul Korea
9. Department of Internal Medicine Catholic University Seoul St. Mary's Hospital Seoul Korea
10. Department of Internal Medicine Wonkwang University Hospital Iksan Korea
11. Department of Internal Medicine Inha University Hospital Incheon Korea
12. Department of Internal Medicine Chungnam National University Hospital Daejeon Korea
13. Department of Internal Medicine Kyungpook National University Chilgok Hospital Daegu Korea
14. Department of Internal Medicine Catholic University Yeouido St. Mary's Hospital Seoul Korea
15. Department of Internal Medicine Yonsei University Severance Hospital Seoul Korea
16. Department of Internal Medicine Hallym University Sacred Heart Hospital Anyang Korea
17. Department of Internal Medicine Pusan National University Yangsan Hospital Yangsan Korea