1. Department of Surgery, Korea Institute of Radiological & Medical Sciences, Korea Cancer Center Hospital, Seoul, Korea.
2. Department of Pathology, Korea Institute of Radiological & Medical Sciences, Korea Cancer Center Hospital, Seoul, Korea.
3. Department of Surgery, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.
4. Department of Pathology, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.
5. Department of Surgery, Konkuk University College of Medicine, Seoul, Korea.