1. Division of Cardiology, Busan Paik Hospital, University of Inje College of Medicine, Busan, Korea.
2. Department of Neurology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
3. Division of Cardiology, Kosin University Medical Center, Busan, Korea.
4. Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
5. Division of Cardiology, Pusan National University Yangsan Hospital, Yangsan, Korea.
6. Department of Cardiovascular Surgery, Busan National University Yangsan Hospital, Yangsan, Korea.