1. Department of Internal Medicine; Chonbuk National University Medical School; Jeonju Korea
2. Research Institute of Clinical Medicine; Chonbuk National University-Chonbuk National University Hospital; Jeonju Korea
3. Department of Internal Medicine; School of Medicine; CHA University; Seongnam Korea
4. Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam Korea
5. Department of Internal Medicine; Soonchunhyang University College of Medicine; Seoul Korea
6. Department of Internal Medicine; Chonnam National University Hwasun Hospital; Jeollanam-do Korea
7. Department of Internal Medicine; VHS Medical Center; Seoul Korea
8. Department of Internal Medicine; Catholic University of Daegu School of Medicine; Daegu Korea
9. Department of Internal Medicine; Dong-A University College of Medicine; Busan Korea
10. Department of Internal Medicine; Ewha Womans University School of Medicine; Seoul Korea
11. Department of Internal Medicine; Seoul National University Hospital; Seoul Korea
12. Department of Medicine; Samsung Medical Center; Sungkyunkwan University College of Medicine; Seoul Korea