1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
2. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
3. School of Bioresources and Bioscience, Chung-Ang University, Anseong, Republic of Korea.
4. Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Republic of Korea.
5. Department of Internal Medicine, Chosun University Hospital, Gwangju, Republic of Korea.
6. Department of Internal Medicine, Chonbuk National University, Jeonju, Republic of Korea.
7. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea.
8. Department of Internal Medicine, National Health Insurance Corporation Ilsan Hospital, Goyang, Republic of Korea.
9. Department of Internal Medicine, Myongji Hospital, Goyang, Republic of Korea.
10. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea.
11. Department of Internal Medicine, Wonkwang University Hospital, Iksan, Republic of Korea.
12. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Republic of Korea.