1. Department of Internal Medicine, Severance Hospital, Seoul, Korea
2. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
3. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
4. Department of Radiology, Gangneung Asan Hospital, Gangneung, Korea
5. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
6. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
7. Department of Internal Medicine, National Cancer Center, Goyang, Korea
8. Department of Internal Medicine, Seoul St. Mary’s Hospital, Seoul, Korea
9. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea
10. Department of Internal Medicine, Asan Medical Center, Seoul, Korea