1. Department of Pathology, Dong-A University College of Medicine, Busan, Korea.
2. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
3. Department of Radiation Oncology, Dong-A University College of Medicine, Busan, Korea.
4. Department of Radiology, Dong-A University College of Medicine, Busan, Korea.
5. Department of Thoracic Surgery, Dong-A University College of Medicine, Busan, Korea.