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Article Citation
Zhang WG, Linghu EQ, Chai NL, Li HK. Ling classification describes endoscopic progressive process of achalasia and successful peroral endoscopy myotomy prevents endoscopic progression of achalasia. World J Gastroenterol 2017; 23(18): 3309-3314 [PMID: 28566891 DOI: 10.3748/wjg.v23.i18.3309]
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