1. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea
2. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
3. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Jeollabuk-do, Korea
5. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Wonkwang University College of Medicine, Iksan, Jeollabuk-do, Korea
7. Department of Internal Medicine, Inje University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Gangwon-do, Korea