A prospective randomized controlled trial of autofluorescence imaging colonoscopy with transparent hood versus conventional colonoscopy for adenoma detection.

INTERVENTION: White light imaging without hood group White light imaging with hood group Autofluorescence imaging without hood group Autofluorescence imaging with hood group CONDITION: Colorectal neoplasm PRIMARY OUTCOME: Neoplasm detection rate SECONDARY OUTCOME: Total number of cancers in both group.; Total number of depressed/flat/sessile lesions. Total number of hyperplastic polyp. Total number of adenomas less than 5mm. Right‐sided versus left‐sided location. Total number of adenomas larger than 1cm. Total number of patients with polyps. Total number of patient with adenoma less than 5mm. Procedure time (intubation time and observation time). Adverse event. INCLUSION CRITERIA: 1)Patients who are undergoing screening colonoscopy for positive fecal occult blood examination, or surveillance colonoscopy after endoscopic resection for colorectal neoplasm. 2)Patients who provided written informed consent