title: Upper-esophageal sphincter dysfunction. Pathogenesis and treatment.
mesh_terms: D003680:Deglutition Disorders / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy; D004943:Esophagogastric Junction / Q000503:physiopathology*; D006801:Humans; D008365:Manometry; D008722:Methods