1. Department of Internal Medicine St. Paul's Hospital The Catholic University of Korea College of Medicine Seoul Korea
2. Department of Internal Medicine Konkuk University College of Medicine Seoul Korea
3. Department of Internal Medicine Soonchunhyang University College of Medicine Seoul Korea
4. Department of Respiratory and Critical Care Medicine Kyung Hee University College of Medicine Seoul Korea
5. Department of Internal Medicine Korea University College of Medicine Seoul Korea
6. Department of Internal Medicine Chung‐Ang University College of Medicine Seoul Korea
7. Department of Internal Medicine Seoul Metropolitan Governmental Seoul National University Boramae Medical Center Seoul Korea
8. Department of Internal Medicine Seoul St. Mary's Hospital The Catholic University of Korea College of Medicine Seoul Korea
9. Department of Internal Medicine Yeungnam University College of Medicine Daegu Korea
10. Department of Internal Medicine Seoul National University College of Medicine Seoul Korea