1. Department of Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
2. Cancer Research Institute, Myongji Hospital, Goyang, Korea.
3. Department of Pathology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
4. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea.