UEMR vs. CEMR for Diminutive Non-pedunculated Colorectal Polyps

Inclusion Criteria: Patients age between 18-75 years old with non-pedunculated colonic polyps (measuring between 4 and 9mm), who willing to participate in this study. Exclusion Criteria: 1. pregnancy, 2. inflammatory bowel disease, 3. familial polyposis 4. the use of anticoagulant therapy or antiplatelet therapy 5. the absence of informed patient consent. 6. Polyps showing signs of deep submucosal invasion