NEWLY DEVELOPED EVALUATION OF ESOPHAGEAL WALL MOTION USING ENDOSCOPIC ULTRASONOGRAPHY VIA TRANSNASAL ENDOSCOPY: CLINICAL APPLICATION IN ESOPHAGEAL ACHALASIA.

INTRODUCTION: A new, minimally invasive method is needed to evaluate both esophageal muscle contraction and esophageal wall distensibility under physiological conditions. The primary objective of this study was to establish a novel examination method…

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