1. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
2. Konyang University Myunggok Medical Research Institute Daejeon, Korea
3. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
4. Department of Internal Medicine, Gyeongsang National University, College of Medicine, Jinju, Korea
5. 5Department of Internal Medicine, Kyungpook National University, School of Medicine, Daegu, Korea
6. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
7. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea
8. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
9. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Changwon, Korea
10. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
11. Department of Preventive Medicine, Korea University College of Medicine, Seoul, Korea