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Peroral Endoscopic Shorter versus Longer Myotomy for the Treatment of Achalasia: A Comparative StudyGong, Wei; Tang, Xiaowei; Huang, Silin; Ren, Yutang; Gao, Qiaoping; Zhou, Jieqiong; Zhang, Xiaofeng; Jiang, Bo · American Journal of Gastroenterology · 2016