biliopancreatic diversion procedure

gastric bariatric stomach surgery gastrectomy obesity laparoscopic loss vector cut operation weight illustration anatomy medical gut procedure patient system overweight reduction diabetes gastrointestinal waist obese surgeon digestive gastroenterology organ size human digestion healthy fat weightloss medicine health section diversion biliopancreatic duodenal switch intestine remove delete bpd gastroplasty surgical gallbladder suturing