Within Fig. 1, Group 2 (Intermediate Risk) was erroneously noted to include patients with a newly diagnosed subtotally resected (STR) WHO Grade II tumor. These patients were not enrolled in Group 2, rather they were included in Group 3 (High Risk). The correct figure is shown below.
The authors apologize to the readership for this error. The article has been corrected online as of September 28, 2018.
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