1. Department of Internal Medicine, Incheon St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Incheon, Korea
2. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
3. Department of Internal Medicine, Yeouido St. Mary’s Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Ewha Medical Research Institute, Ewha Womans University School of Medicine, Seoul, Korea
5. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
6. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea
7. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea
8. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Korea
9. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje Univeristy College of Medicine, Busan, Korea