Endoscopy Standard sedated endoscopy will be performed by a trained gastroenterologist. The endoscopy will be performed according to the standard clinical protocol. During endoscopy the examiner will pay particular attention to the esophageal mucosa, the size of the gastric pouch above the band (baseline examination), the size of the gastric pouch above the gastro-jejunal anastomosis (post-operative examination), the presence of ulcerations at the site of gastric banding/gastric bypass.