All patient data were collected from electronic medical records and endoscopy reports using a natural language processing tool developed in our institution
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. Variables collected included patient age, sex, race, and body mass index; EMR details; AEs; colon polyp morphology, pathology, and recurrence; and referral for surgery. Data were collected using a detailed, structured field format in an endoscopic reporting system (EndoWorks; Olympus, Center Valley, Pennsylvania, United States; ProVation Medical, Minneapolis, Minnesota, United States). Detailed photographic documentation of each EMR was performed, consisting of 20 to 30 photographs per resection. In addition, videos of all large EMRs (n = 120) were uploaded to the EMR Channel at YouTube (