1. Department of Surgery, Colorectal Cancer Special Clinic, University Health System, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Surgery, Dongtan Sacred Heart Hospital, Hallym University Medical Center, Hwasung, Korea.
3. Department of Biochemistry, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Pathology, Hangang Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea.