A 50-year-old obese man (BMI = 32 kg/m2 ) comes to the physician complaining of indigestion after meals, bloating, and heaburn. Vital signs are normal. A CT scan of the abdomen reveals a hiatal hernia of the esophagus. Endoscopic biopsy shows thickening of the basal layer of the squamous epithelium, upward extension of the papillae of the lamina propria, and an increased number of neutrophils and lymphocytes.Which of the following is the most likely diagnosis?