6WEHRMAHH T, KOKABPPCH H, JACBI V, et al. Long-term results of endoscopic injection of botulinum toxin in elderly achalasic patients with tortuous megaesophagus or epiphrenic diverticulum[J]. Endoscopy, 1999, 31: 352-358.
7KADAKIA SC, WONG RK. Graded pneumatic dilation using rigiflex achalasia dilation in patients with primary esophageal achalasia[J]. Am J Gastroenterol, 1993, 88: 34-38.
8CIAROLLA DA, TRAUBLE M, ACHALASIA. short-term clinical monitoring after pneumatic dilation[J]. Dig Dis Sci, 1993, 38:1905-1908.
9SCHWARTZ HM, CAHOW CE, PARKMAN HP, et al. Complication during pneumatic dilation for achalasia or diffuse esophageal spasm. Analysis of risk factors, early clinical characteristics, and outcome[J]. Dig Dis Sci, 1993, 38: 1893-1904.
