Annotation the significance of Schatzki's ring.
D003680:Deglutition Disorders / Q000209:etiology*; D004940:Esophageal Stenosis / Q000209:etiology*; D004941:Esophagitis / Q000150:complications; D004943:Esophagogastric Junction / Q000502:physiology; D005764:Gastroesophageal Reflux / Q000150:complications; D006548:Hernia, Diaphragmatic / Q000150:complications; D006801:Humans