1. Department of Internal Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea.
2. Department of Internal Medicine, Bundang Hospital, Seoul National University, Seongam, Republic of Korea.
3. Department of Internal Medicine, University Healthcare System, Seoul National University, Seoul, Republic of Korea.
4. Department of Internal Medicine, Chung-Ang University Hospital, College of Medicine, Chung-Ang University, Seoul, Republic of Korea.