1. Division of Cardiology, Chung-Ang University Gwangmyeong Hospital and Department of Internal Medicine, Chung-Ang University College of Medicine, Gwangmyeong, Korea.
2. Department of Cardiology, Keimyung University Dongsan Hospital, Daegu, Korea.
3. Department of Internal Medicine, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Chonnam National University Hospital, Chonnam National University College of Medicine, Gwangju, Korea.
5. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju, Korea.
7. Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University, Wonju College of Medicine, Wonju, Korea.
8. Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
9. Department of Internal Medicine, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea.
10. Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea.
11. Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Kyung Hee University Medical Center, Kyung Hee University College of Medicine, Seoul, Korea.
13. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine, Changwon, Korea.
14. Bucheon Sejong Hospital, Bucheon, Korea.
15. Incheon Saint Mary's Hospital, Incheon, Korea.
16. Department of Internal Medicine, Ulsan University Hospital, Ulsan University College of Medicine, Ulsan, Korea.
17. Department of Internal Medicine, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
18. Department of Internal Medicine, Dong-A University Hospital, Dong-A University College of Medicine, Busan, Korea.
19. Department of Cardiology, Inje University Haeundae Baek Hospital, Inje University College of Medicine, Busan, Korea.