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. 2022 Feb 12;46(5):1141–1150. doi: 10.1007/s00268-022-06467-3

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Fig. 2 — a Overall survival rate of patients who underwent high-level liver surgery for hepatocellular carcinoma before (first period) and after (second period) the establishment of the board certification system for expert surgeon. b Influence of expert surgeon for overall survival rate of matched patients who underwent high-level hepatectomy. c Influence of expert surgeon for overall survival rate of matched patients who underwent hepatectomy of one segment (OSeg). d Influence of expert surgeons for overall survival rate of matched patients who underwent hepatectomy of more than one segment (MOSeg)