title: Manometry vs. pH step-up.
authors.forename: H E
authors.initials: HE
authors.lastname: Mattox
authors.forename: J E
authors.initials: JE
authors.lastname: Richter
mesh_terms: D004566:Electrodes; D004943:Esophagogastric Junction / Q000503:physiopathology*; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008365:Manometry