1. Department of Pathology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Republic of Korea
2. Center for Colorectal Cancer, Research Institute and Hospital, National Cancer Center, Goyang-si 10408, Republic of Korea
3. Research Institute, National Cancer Center, Goyang-si 10408, Republic of Korea
4. Department of Surgery, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
5. Department of Pathology and Center for Colorectal Cancer, Research Institute and Hospital, National Cancer Center, Goyang-si 10408, Republic of Korea