title: 24-hour monitoring of oesophageal pH in outpatients.
mesh_terms: D004947:Esophagus / Q000503:physiopathology*; D005764:Gastroesophageal Reflux / Q000503:physiopathology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008991:Monitoring, Physiologic / Q000379:methods*; D010045:Outpatients; D013997:Time Factors