1. Department of Internal Medicine; Seoul National University Hospital; Seoul Korea
2. Sungkyunkwan University College of Medicine; Seoul Korea
3. University of Ulsan College of Medicine; Seoul Korea
4. Chungbuk National University College of Medicine; Cheongju Korea
5. Kyungpook National University College of Medicine; Daegu Korea
6. The Catholic University of Korea; Seoul Korea
7. Yonsei University College of Medicine; Seoul Korea
8. Seoul National University Bundang Hospital; Seongnam Korea
9. Yonsei University Wonju College of Medicine; Wonju Korea
10. Heart Research Center of Chonnam National University; Gwangju Korea
11. National Institute of Health (NIH); Osong Korea