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medicine ulcerative colitis biological therapy infliximab esophagus liver transplantation ipaa transhiatal esophagectomy antropylorus donor imaging in ldlt donor evaluation donor safety in ldlt donor workup protocol in ldlt donor morbidity living donor ldlt third space endoscopy endoscopic therapy gerd after poem apvt gluteoplasty gluteus maximus wrap total anorectal reconstruction neo-anal sphicters high arm permanent colostomy ulcerative colitis ulcerative colitis surgery total proctocolectomy pouch surgery ileal pouch rectal prolapse surgery hepato-biliary surgery perioperative care hipec cytoreductive surgery bile duct injury timing of repair obesity diabetes bariatric bariatric surgery metabolic surgery surgery for diabetes weight loss surgery esophagectomy esophageal cancer esophageal surgery ivor lewis esophagectomy 2 field vs 3 field lymphadenectomy mie ibd biological therapy achalasia cardia poem per oral myotomy hellers myotomy colorectal cancer open surgery laparoscopic surgery lap colorectal surgery quality of life oncological outcome lap vs open colorectal surgery lap vs open vs robotic colorectal surgery color trial alakart trial acosog trial classic evidence for laparoscopic colorectal surgery liver tumors benign liver tumors hemangioma liver focal nodular hyperplasia liver adenoma hemangioendothelioma esophageal carcinoma cancer esophagus gall bladder polyps gall bladder polyps incidental gb polyps malignant potential of gb polyps surgery for gb polyps internal rectal prolapse rectal intussusception rectopexy abdominal rectopexy mesh rectopexy posterior rectopexy ventral rectopexy anterior rectopexy ventral mesh rectopexy laparoscopic rectopexy resection rectopexy liver anatomy biliary anatomy hilar plate plate system of liver segmental anatomy of liver liver resection liver surgery hbp surgery carcinoma stomach carcinoma stomach stomach cancer gastric cancer d2 vs d1 lymphadenctomy d2 lymphadenectomy nccn guidelines cholecystectomy for gb polyps