The relative application of endoscopy and other diagnostic methods in achalasia.
D003680:Deglutition Disorders / Q000209:etiology; D004931:Esophageal Achalasia / Q000175:diagnosis* / Q000000981:diagnostic imaging; D004945:Esophagoscopy; D006801:Humans; D008365:Manometry; D010146:Pain / Q000209:etiology; D011859:Radiography; D013909:Thorax