1. Department of Pathology, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Pathology, Presbyterian Medical Center, Jeonju, Korea.
3. Department of Thoracic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
4. Department of Pathology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.