1. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Radiology, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. Department of Pathology, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Thoracic and Cardiovascular Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea.