1Division of Cardiology, Department of Internal Medicine, Soon Chun Hyang University Hospital, Seoul, Korea
2Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea
3Division of Cardiology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea
4Division of Cardiology, Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
5Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
6Division of Cardiology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
7Division of Cardiology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea
8Division of Cardiac Electrophysiology, Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea
9Division of Cardiology, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
10Divison of Cardiology, Department of Internal Medicine, The Catholic University of Korea Yeouido St. Mary’s Hospital, Seoul, Korea