Determination of acid reflux.
D004942:Esophagitis, Peptic / Q000209:etiology; D005764:Gastroesophageal Reflux / Q000175:diagnosis* / Q000601:surgery; D006548:Hernia, Diaphragmatic / Q000175:diagnosis; D006801:Humans; D008365:Manometry; D009092:Mucous Membrane