The role of endoscopy in the surveillance of premalignant conditions of the upper gastrointestinal tract. Guidelines for clinical application.
D000752:Anemia, Pernicious / Q000175:diagnosis; D001471:Barrett Esophagus / Q000175:diagnosis; D004931:Esophageal Achalasia / Q000175:diagnosis; D004938:Esophageal Neoplasms / Q000175:diagnosis*; D004945:Esophagoscopy; D005773:Gastroscopy; D006801:Humans; D011127:Polyps / Q000175:diagnosis; D011182:Postoperative Care; D011230:Precancerous Conditions / Q000175:diagnosis*; D013274:Stomach Neoplasms / Q000175:diagnosis*