title: Letter: Relation of hiatus hernia to esophageal sphincter competence.
mesh_terms: D004943:Esophagogastric Junction / Q000503:physiopathology*; D005764:Gastroesophageal Reflux / Q000209:etiology / Q000503:physiopathology; D006548:Hernia, Diaphragmatic / Q000150:complications*; D006801:Humans; D012494:Sampling Studies; D013223:Statistics as Topic