The procedure was performed using an endoscope (GIF-H260Z or GIF-H290Z; Olympus Co., Tokyo, Japan). The endoscopy system consisted of a video processor (CV-260SL or CV-290; Olympus) and a light source (CLV-260SL or CLV-290SL; Olympus) that worked in both the high-resolution WLI and NBI modes. A soft black hood (MAJ-1989 or MAJ-1990; Olympus) was mounted on the tip of the endoscope to enable the endoscopist to maintain a consistent distance between the tip of the endoscope and the mucosal surface to obtain in-focus endoscopic images at maximal magnification. Structural enhancement of the endoscopic video processor was set to B-mode level 4 – 6 for white-light endoscopy and to B-mode level 8 for M-NBI. The color mode was set at level 1.

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