title: The value of endoscopy and secretion studies in the management of recurrent symptoms after surgery for peptic ulceration.
mesh_terms: D004724:Endoscopy; D005750:Gastric Juice / Q000378:metabolism; D005773:Gastroscopy; D010434:Pepsin A / Q000378:metabolism; D010437:Peptic Ulcer / Q000175:diagnosis / Q000601:surgery; D012008:Recurrence
chemical_list: D010434:Pepsin A