**Author details**

Themistoklis I. Papasilekas\*, Konstantinos M. Themistoklis, Stefanos I. Korfias and Damianos E. Sakas Department of Neurosurgery, National and Kapodistrian University of Athens, Evaggelismos General Hospital, Athens, Greece

\*Address all correspondence to: th.papasilekas@gmail.com

© 2019 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.
