1. Department of Internal Medicine, Seoul National University College of Medicine, Boramae Medical Center, Seoul, Korea.
2. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
4. Department of Nuclear Medicine, Chonnam National University School of Medicine, Gwangju, Korea.
5. Department of Nuclear Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
6. Department of Surgery, Yonsei University School of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.