title: Letter: Examination of the oesophagus in the erect, forward-bending position.
mesh_terms: D001466:Barium Sulfate; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D011187:Posture; D011859:Radiography
chemical_list: D001466:Barium Sulfate