1. Department of Radiology; Seoul National University College of Medicine; Seoul Korea
2. Institute of Radiation Medicine; Seoul National University Medical Research Center; Seoul Korea
3. Institute of Allergy and Clinical Immunology; Seoul National University Medical Research Center; Seoul Korea
4. Department of Internal Medicine; Seoul National University College of Medicine; Seoul Korea
5. Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam Korea
6. Department of Medicine; Seoul National University College of Medicine; Seoul Korea
7. Cancer Research Institute; Seoul National University; Seoul Korea