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. 2020 Aug 18;44(3):1713–1720. doi: 10.1007/s10143-020-01369-1

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© The Author(s) 2020, corrected publication 2021

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Fig. 2 — Kaplan–Meier plots showing correlations between the extent of resection and progression. PFI correlated with the Simpson grade (p = .003, a) and was also shorter after STR as compared with GTR after dichotomization into Simpson I-II vs ≥ III (p = .007, b) and Simpson I-III vs ≥ IV (p = .001, c)