1. Division of Cardiology, Department of Internal Medicine Kangwon National University School of Medicine Chuncheon Republic of Korea
2. Department of Cardiology Chonnam National University Hospital Gwangju Republic of Korea
3. Division of Cardiology, Severance Cardiovascular Hospital Yonsei University College of Medicine Seoul Republic of Korea
4. Department of Cardiology, CHA Bundang Medical Center CHA University School of Medicine Seongnam Republic of Korea