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OUP This is a pre-copyedited, author-produced version of an article accepted for publication in British Journal of Anaesthesia, following peer review. The version of record T. E. F. Abbott, A. J. Fowler, T. D. Dobbs, E. M. Harrison, M. A. Gillies, R. M. Pearse; Frequency of surgical treatment and related hospital procedures in the UK: a national ecological study using hospital episode statistics, BJA: British Journal of Anaesthesia, Volume 119, Issue 2, 1 August 2017, Pages 249–257, doi: 10.1093/bja/aex137 is available online at https://doi.org/10.1093/bja/aex137