1. Department of Internal Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea.
3. Department of Internal Medicine, Myongji Hospital, Goyang, Korea.
4. Department of Internal Medicine, Chung-Ang University Medical Center, Seoul, Korea.
5. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Gil Hospital, Gachon University College of Medicine, Incheon, Korea.
7. Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.
8. Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
9. Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea.