title: Radiotelemetry pH determination for gastroesophageal reflux. An analysis of 521 cases.
mesh_terms: D005069:Evaluation Studies as Topic; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008722:Methods; D011845:Radio; D011859:Radiography; D013686:Telemetry