The Performance of Peroral Endoscopic Myotomy in Sigmoid-Type Achalasia by Chainarong Phalanusitthepha, Siwaree Maneesoi, Jirawat Watthanatha, Tharathorn Suwatthanarak, Vitoon Chinswangwatanakul, Thawatchai Akaraviputh, Asada Methasate, Monthira Maneerattanaporn, Somchai Leelakusolvong

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