<qa>  What type of surgery is the liver?- elective laparoscopic and open surgery of the colon and rectum colectomy, hemicolectomy, segment resection, rectum extirpation, deep anterior rectum resection, sigmoid resection, proctocolectomy, of the stomach total, subtotal and atypical gastric resections, of the pancreas any kind of pancreatic resections, and of the liver hemihepatectomy, atypical resection, anatomical segment resection 