1. Department of Medicine, Yonsei University Graduate School
2. Division of Cardiology, Department of Internal Medicine, Inha University Hospital
3. Department of Cardiology and Cardiovascular Center, Gangnam Severance Hospital, Yonsei University College of Medicine
4. Graduate School of Health and Welfare CHA University
5. Division of Cardiology, Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine
6. Division of Cardiology, Department of Internal Medicine, NHIC Ilsan Hospital