title: Letter: Does hiatus hernia affect competence of the gastrooesophageal sphincter?
mesh_terms: D004943:Esophagogastric Junction / Q000503:physiopathology*; D006548:Hernia, Diaphragmatic / Q000503:physiopathology*; D006551:Hernia, Hiatal / Q000503:physiopathology*; D006801:Humans; D009119:Muscle Contraction; D011312:Pressure