title: Esophagrams are useful.
mesh_terms: D001466:Barium Sulfate; D004947:Esophagus / Q000000981:diagnostic imaging*; D005764:Gastroesophageal Reflux / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D011859:Radiography
chemical_list: D001466:Barium Sulfate