1. Department of Internal Medicine; The Catholic University of Korea; St. Vincent's Hospital; Suwon Korea
2. Department of Internal Medicine; Korea University; Seoul Korea
3. Department of Internal Medicine; Sungkyunkwan University; Seoul Samsung Hospital; Seoul Korea
4. Department of Internal Medicine; Kyung Hee University; Seoul Korea
5. Department of Internal Medicine; Sungkyunkwan University; Kangbuk Samsung Hospital; Seoul Korea
6. Department of Internal Medicine; Seoul National University; Seoul Korea
7. Department of Internal Medicine; Yonsei University; Seoul Korea
8. Department of Internal Medicine; Inje University; Seoul Paik Hospital; Seoul Korea
9. Department of Internal Medicine; Inje University; Haeundae Paik Hospital; Busan Korea
10. Department of Internal Medicine; Soonchunghyang University; Cheonan Hospital; Cheonan Korea
11. Department of Internal Medicine; Yeungnam University; Daegu Korea
12. Department of Internal Medicine; Eulji University; Daejeon Korea
13. Department of Internal Medicine; Keimyung University; Daegu Korea
14. Department of Internal Medicine; Chung-Ang University; Seoul Korea