1. Department of Internal Medicine, School of Medicine, Inha University, Incheon, Korea.
2. Department of Thoracic Surgery, School of Medicine, Inha University, Incheon, Korea.
3. Department of Pathology, School of Medicine, Inha University, Incheon, Korea.
4. Department of Radiology, School of Medicine, Inha University, Incheon, Korea.