Position of the distal esophageal sphincter and its relationship to reflux.
D000005:Abdomen; D004943:Esophagogastric Junction / Q000503:physiopathology*; D004947:Esophagus / Q000033:anatomy & histology*; D005764:Gastroesophageal Reflux / Q000503:physiopathology*; D006551:Hernia, Hiatal / Q000503:physiopathology; D006801:Humans; D011312:Pressure