**Author details**

Tryggve Lundar1,2\* and Bernt Johan Due-Tønnessen1

1 Department of Neurosurgical, Oslo University Hospital, Oslo, Norway

2 Department of Neurosurgical, University of Oslo, Oslo, Norway

\*Address all correspondence to: tryggve.lundar@gmail.com

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
