title: Why, when, and how to investigate gastroesophageal reflux disease.
mesh_terms: D001466:Barium Sulfate; D004724:Endoscopy; D004943:Esophagogastric Junction / Q000503:physiopathology; D004947:Esophagus / Q000503:physiopathology; D005745:Gastric Acidity Determination; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008365:Manometry; D009119:Muscle Contraction; D011859:Radiography
chemical_list: D001466:Barium Sulfate