1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
2. Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
3. Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea.
4. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea.
5. Department of Internal Medicine, Pusan National University School of Medicine and Medical Research Institute, Pusan National University Hospital, Busan, Korea.
6. Department of Internal Medicine, Chonbuk National University Hospital, Jeonju, Republic of Korea.
7. Department of Internal Medicine, Chosun University Hospital, Gwangju, Republic of Korea.
8. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea.
9. Department of Internal Medicine, Yonsei University Wonju College of Medicine Wonju Severance Christian Hospital, Wonju, Korea.