1. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.
2. Cardiovascular Division, Yeungnam University College of Medicine, Yeungnam University Medical Center, Daegu, Korea.
3. Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
4. Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea.