1. Division of Cardiology, Department of Internal Medicine, NHIS Ilsan Hospital, Goyang, Korea.
2. Division of Cardiology, Department of Internal Medicine, Heart Center, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.