1. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
2. Department of Internal Medicine, Sungkyunkwan University College of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
5. Department of Internal Medicine, Kyungpook National University College of Medicine, Daegu, Korea.
6. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
7. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
9. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
10. Department of Internal Medicine, Heart Research Center of Chonnam National University, Gwangju, Korea.
11. Division of Cardiovascular and Rare Diseases, Korea National Institute of Health, Cheongju, Korea.