Gastrointestinal symptoms.
D001466:Barium Sulfate; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D006863:Hydrogen-Ion Concentration; D011859:Radiography; D011877:Radionuclide Imaging
D001466:Barium Sulfate