经腹行改良Heller术联合Dor术治疗老年贲门失弛缓症患者的疗效观察
경복행개량Heller술연합Dor술치료노년분문실이완증환자적료효관찰
Curative effect of trans-abdominal Heller combined with Dor fundoplication on esophageal achalasia in the elderly
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