1. Department of Internal Medicine, Gachon Medical School, Korea.
2. Department of Internal Medicine, University of Ulsan Medical School, Korea.
3. Department of Internal Medicine, Sungkyunkwan University School of Medicine, Korea.
4. Department of Internal Medicine, Ehwa Women's University College of Medicine, Korea.
5. Department of Internal Medicine, Kyunghee University College of Medicine, Korea.
6. Department of Internal Medicine, Korean Cancer Center Hospital, Korea.
7. Department of Internal Medicine, Seoul National University College of Medicine, Korea.
8. Department of Internal Medicine, Hanyang University College of Medicine, Korea.
9. Department of Internal Medicine, Hallym University College of Medicine, Korea.
10. Department of Internal Medicine, Pochon CHA University College of Medicine, Korea.
11. Department of Internal Medicine, Ajou University College of Medicine, Korea.
12. Department of Internal Medicine, Chung-Ang University College of Medicine, Korea.
13. Department of Internal Medicine, Chungnam National University College of Medicine, Korea.