1. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
2. Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
3. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
5. Department of Internal Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Korea
6. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
7. Department of Internal Medicine, Gangneung Asan Hospital, Universityof Ulsan College of Medicine, Gangneung, Gangwon-do, Korea
8. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Chungcheongnam-do, Korea
9. Department of Internal Medicine, International St. Mary’s Hospital, College of Medicine, Catholic Kwandong University, Incheon, Korea
10. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
11. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
12. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea