Achalasia
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References:

1) Woodfield CA, Levin M, Rubesin SE. Diagnosis of Primary Versus Secondary Achalasia:
Reassessment of Clinical and Radiographic Criteria. AJR 2000;175:727-731
[PDF]

2) Sandler RS, Nyren O, Ekbom A, Eisen GM, Yuen J, Josefsson S. The risk of esophageal cancer
in patients with achalasia: a population-based study. JAMA 1995;274:1359-1362

3) Spechler SJ, Castell DO. Classification of oesophageal motility abnormalities. Gut
2001;49:145-151
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4) Pohl D, Tutuian R. Achalasia: an Overview of Diagnosis and Treatment. J Gastrointestin Liver
Dis 2007;16(3):297-303
[PDF]

5) Sanderson DR, Ellis EH, Schlegel JF. Syndrome of Vigorous Achalasia: Clinical and
Physiologic Observations. Dis Chest 1967;52:508-517
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