“…The severity of heartburn and regurgitation, night-time epigastric pain/discomfort, burping/belching, nausea, non-cardiac retrosternal pain/tightness, early satiety, sleep disturbances, flatulence, halitosis, globus, dysphagia, water brash/sialorrhea, retching, odynophagia, dysphonia/hoarseness, nonproductive cough and dyspnea was rated on a 4-point Likert scale (none = no symptoms [absent or non-detected]; mild = hardly perceptible symptoms, with only slight general discomfort; moderate = clearly perceptible symptoms, but tolerable without demanding immediate relief; severe = overwhelming discomfort, requiring immediate relief). This structured interview has previously been shown to have sufficient sensitivity to detect group differences or changes in symptom severity with PPI treatment 10,11…”