Effect of Serrated Polyps and High-grade Dysplasia at Index Colonoscopy on Risk of Metachronous High-risk Adenomas

During colonoscopy, the endoscopist will document colonoscopy indication; BBPS score; withdrawal time; adenoma and polyp detection rate at index and follow-up colonoscopy; completeness of polypectomy; polyp location, size, surface, morphology (Paris classification), histopathology; complications.