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R-LC angles ranged between -38° and +35°. The mean R-LC angle was -0.3° ± 15.9° and its 95% confidence interval was [-4.0°, 3.3°] within [-15°, + 15°]. When indicating lesion locations as times on a clock face, there may be an error of ±30 min (±15°); therefore, R- and LC-lines were demonstrated to be identical using an equivalence test. CONCLUSIONS Using this method, the circumferential position of small lower esophageal lesions may be reliably represented as a clock face.BACKGROUND Cancer diagnoses are increasing rapidly due to the ag