1. Division of Cardiology, Department of Internal Medicine, Hanyang University Medical Center, Seoul, Korea
2. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
3. Division of Cardiology, Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea
4. Department of Cardiology Cardiovascular Center Kyung Hee University Hospital at Gangdong, Seoul, Korea
5. Department of Assurance Support/General Manager, National Health Insurance Service, Wonju, Korea
6. Department of Internal Medicine, School of Medicine, Cardiovascular Center, Ewha Womans University, Seoul, Korea
7. Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Hospital, Daegu, Korea
8. Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju, Korea