2Aloso P, Gonzalez CB, Macenlle R, et al. Achalasia: the usefulness of manometry for evaluation of treatment [J ]. Dig Dis Sci, 1999,44 : 536 -541.
3Annese V, Bassotti G, Coccia G,et al. A multicentre randomized study of intrasphincteric botulinum toxin in patients with oesophageal achalasia. Gut ,2000,46:597 -600.