1. Department of Internal Medicine and Respiratory Center, Kyungpook National University School of Medicine, Daegu, Korea.
2. Department of Thoracic Surgery, Kyungpook National University School of Medicine, Daegu, Korea.
3. Department of Pathology, Kyungpook National University School of Medicine, Daegu, Korea.
4. Department of Radiology, Gyeongsang National University School of Medicine, Jinju, Korea.
5. Department of Internal Medicine, Fatima Hospital, Daegu, Korea.