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Procedure-related colonic transendoscopic enteral tubing. A: It is difficult to find the lumen after the tube is inserted in some subjects because of the gathering of colonic folds and acute angle of colonic lumen caused by the transendoscopic enteral tube pulling; B: Cap-assisted colonoscopy uses a transparent plastic cap attached to the tip of the colonoscope to flatten the semilunar folds and improve mucosal exposure.
