1. Department of Internal Medicine, Catholic University, Korea.
2. Department of Internal Medicine, Korea University, Korea.
3. Department of Internal Medicine, Yonsei University, Korea.
4. Department of Internal Medicine, Kyungpook University, Korea.
5. Department of Internal Medicine, Hanyang University, Korea.
6. Department of Internal Medicine, Kyung Hee University, Korea.
7. Department of Internal Medicine, Sungkyunkwan University, Korea.
8. Department of Internal Medicine, Chonbuk University, Korea.
9. Department of Internal Medicine, Seoul University, Korea.
10. Department of Internal Medicine, Pusan University, Korea.
11. Department of Internal Medicine, Yonsei Wonju University, Korea.
12. Department of Internal Medicine, ChungAng University, Korea.
13. Department of Internal Medicine, Ulsan University, Korea.
14. Department of Internal Medicine, Chungnam University, Korea.
15. Department of Internal Medicine, Chonnam University, Korea.
16. Department of Internal Medicine, National Medical Center, Korea.