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Using high-magnification NBI increased the differential diagnostic skill of the LEE group after expanded training so that it was equivalent to that of the HEE group.

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CO(2) insufflation reduced patient pain after colonoscopy in potentially difficult cases when performed by LECs.

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It was technically easier, safer and more cost-effective to perform ESD for LST in the rectum and the distal sigmoid colon using the newly developed TEA-ESD traction technique.