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Time trends in colorectal liver metastases. (a) Breakdown of diagnosis for patients requiring liver resection stratified per year. (b) Surgery for colorectal liver metastases year by year, with trends of frequencies for major resections, parenchymal sparing resections, use of techniques for hypertrophy and redo surgery. (c) Trend in the use of laparoscopic approach within the whole series of liver resections and specifically in patients with colorectal liver metastases.
