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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. 1 — Flowchart of patient selection. After exclusion of patients with recurrent or spinal lesions and with missing data about outpatient follow-up and the extent of resection, 939 cases were subjected to analyses