title: American Gastroenterological Association medical position statement: guidelines on the use of esophageal pH recording.
mesh_terms: D004947:Esophagus / Q000378:metabolism*; D005762:Gastroenterology; D006801:Humans; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D012955:Societies, Medical; D014481:United States
chemical_list: D006859:Hydrogen