1. Department of Nuclear Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 463-707, Korea.
2. Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul 110-744, Korea.
3. Department of Nuclear Medicine, Konkuk University School of Medicine, Seoul 143-729, Korea.
4. Department of Thoracic & Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul 110-744, Korea.
5. Department of Nuclear Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul 110-744, Korea.