1. Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea
2. Center for Colorectal Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea
3. Department of Pathology, Research Institute and Hospital, National Cancer Center, Goyang, Korea
4. Precision Medicine, Research Institute and Hospital, National Cancer Center, Goyang, Korea
5. Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea
6. Divison of Gastroenterology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea