title: Double-contrast upper gastrointestinal examination: technique and interpretation.
mesh_terms: D001466:Barium Sulfate; D004935:Esophageal Diseases / Q000000981:diagnostic imaging*; D005767:Gastrointestinal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D008722:Methods; D010528:Peristalsis; D011029:Pneumoradiography; D011187:Posture; D012841:Simethicone
chemical_list: D001466:Barium Sulfate; D012841:Simethicone