1. Cardiology Division, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
2. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.
3. Severance Biomedical Science Institute, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.
4. Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.