1. Division of Cardiovascular, Department of Internal Medicine, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea.
2. Department of Preventive Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
3. Division of Cardiology, National Health Insurance Service (NHIS) Ilsan Hospital, Goyang, Korea.
4. Heart Center, Konyang University Hospital, Daejeon, Korea.
5. Department of Cardiovascular Medicine, Regional Cardiocerebrovascular Center, Wonkwang University Hospital, Iksan, Korea.
6. Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
7. Department of Cardiology, Myongji Hospital, Goyang, Korea.
8. Division of Cardiology, Department of Internal Medicine, Chosun University College of Medicine, Gwangju, Korea.
9. Department of Cardiology, Inje University Busan Paik Hospital, Busan, Korea.
10. Division of Cardiovascular, Department of Internal Medicine, Good Morning Hospital, Pyeongtaek, Korea.
11. Department of Internal Medicine, Chungbuk National University, Cheongju, Korea.