1. Department of Internal Medicine, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
2. Department of Internal Medicine, Chonbuk National University Hospital, Chonbuk National University Medical School, Jeonju, Korea.
3. Department of Internal Medicine, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
5. Department of Internal Medicine, Daegu Catholic University Medical Center, Catholic University of Daegu School of Medicine, Daegu, Korea.
6. Department of Internal Medicine, Chosun University Hospital, Chosun University School of Medicine, Gwangju, Korea.
7. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine, Daegu, Korea.
8. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
9. Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea.
10. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
11. Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea.
12. Department of Internal Medicine, Busan St. Mary's Hospital, Catholic University of Pusan, Busan, Korea.
13. Department of Internal Medicine, Changwon Fatima Hospital, Changwon, Korea.
14. Department of Internal Medicine, Dong-A Medical Center, Dong-A University College of Medicine, Busan, Korea.
15. Department of Internal Medicine, Daedong Hospital, Busan, Korea.