1. Department of Internal Medicine, Dongguk University College of Medicine, Goyang,
2. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
4. Department of Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
5. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Jeju National University College of Medicine, Jeju, Korea.
9. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
10. Department of Internal Medicine, Ajou University School of Medicine, Medicine, Sungkyunkwan University School of Medicine, Seoul, KoSuwon, Korea.
11. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
12. Department of Internalrea.
13. Department of Internal Medicine, Hallym University College of Medicine, Seoul, Korea.
14. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
15. Department of Internal Medicine, Inje University College of Medicine, Seoul, Korea.
16. Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul, Korea.