1. Department of Internal Medicine, College of Medicine, Chungnam National University, Daejon, Korea.
2. Cancer Research Institute, Chungnam National University, Daejon, Korea.
3. Department of Therapeutic Radiology, College of Medicine, Chungnam National University, Daejon, Korea.
4. Department of Diagnostic Radiology, College of Medicine, Chungnam National University, Daejon, Korea.
5. Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungnam National University, Daejon, Korea.