The lower esophageal sphincter and reflux esophagitis.
D004943:Esophagogastric Junction / Q000503:physiopathology / Q000601:surgery*; D005764:Gastroesophageal Reflux / Q000601:surgery*; D006801:Humans; D011183:Postoperative Complications / Q000517:prevention & control; D011312:Pressure