title: Twenty-four hour ambulatory oesophageal pH monitoring: an update.
mesh_terms: D000553:Ambulatory Care / Q000379:methods*; D004947:Esophagus / Q000503:physiopathology*; D005764:Gastroesophageal Reflux / Q000175:diagnosis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008991:Monitoring, Physiologic / Q000295:instrumentation*