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Tanaka S, Abe H, Sato H, Shiwaku H, Minami H, Sato C, dll. (October 2021). "Frequency and clinical characteristics of special types of achalasia in Japan: A large-scale, multicenter database study". Journal of Gastroenterology and Hepatology. 36 (10): 2828–2833. doi:10.1111/jgh.15557. PMID34032322. S2CID235200001Check |s2cid= value (bantuan).
Tanaka S, Abe H, Sato H, Shiwaku H, Minami H, Sato C, dll. (October 2021). "Frequency and clinical characteristics of special types of achalasia in Japan: A large-scale, multicenter database study". Journal of Gastroenterology and Hepatology. 36 (10): 2828–2833. doi:10.1111/jgh.15557. PMID34032322. S2CID235200001Check |s2cid= value (bantuan).