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Letter to the editor Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http:// creativecommons. org/ licenses/ by-nc/ 4. 0/. RC and PJM are joint first authors.doi:10.1136/neurintsurg-2020-016619 pmid:32929046 fatcat:cao6cgepgfbt7pbwe3jmffhlky