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Background Since its introduction in 2010, per oral endoscopic myotomy (POEM) has offered an alternative to laparoscopic Heller myotomy for the treatment of achalasia. A gastric myotomy length of 3 cm has been recommended; however, it can be difficult to ensure that adequate submucosal dissection has been performed during the procedure. Commonly accepted endoscopic markers of the gastric side can...
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