1. Division of Cardiology, Department of Internal Medicine, Dongguk University Gyeongju Hospital, Dongguk University College of Medicine, Gyeongju, Korea.
2. Department of Internal Medicine, Cardiovascular Center, Dongguk University Illsan Hospital, Dongguk University College of Medicine, Goyang, Korea.
3. Division of Cardiology, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
4. Division of Cardiology, Department of Internal Medicine, St. Vincent's Hospital, The Catholic University of Korea, Suwon, Korea.
5. Division of Cardiology, Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
6. Division of Cardiology, Department of Internal Medicine, Bucheon St. Mary's Hospital, The Catholic University of Korea, Bucheon, Korea.
7. Division of Cardiology, Department of Internal Medicine, Cheju Halla General Hospital, Jeju, Korea.
8. Department of Cardiology, Korea University Ansan Hospital, Ansan, Korea.
9. Division of Cardiology, Department of Internal Medicine, Kwangju Christian Hospital, Gwangju, Korea.
10. Department of Internal Medicine, Pohang St. Mary's Hospital, Pohang, Korea.
11. Division of Cardiology, Department of Internal Medicine, Pohang Semyeong Christianity Hospital, Pohang, Korea.
12. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Soonchunhyang University School of Medicine, Seoul, Korea.