1. Department of Nuclear Medicine, Konkuk University Medical Center, Research Institute of Biomedical Science, Konkuk University School of Medicine, Seoul 05030, Korea.
2. Department of Radiology, Konkuk University Medical Center, Research Institute of Biomedical Science, Konkuk University School of Medicine, Seoul 05030, Korea.
3. Department of Internal Medicine, Division of Cardiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea.
4. Department of Nuclear Medicine, Seoul Medical Center, Seoul 02053, Korea.