barett esophagus disease medical on white background

achalasia acid anatomical anatomy background barett barrett body care diagnosis diagnostic digestion digestive disease duodenum endoscope endoscopy eps esophageal esophagus exam expansion gastric gastroenterology gastroesophageal gastrointestinal gastroscopy health hospital human illness illustration indigestion inflammation instrument medical medicine organ patient procedure reflux science sphincter stomach system throat tract treatment type white