**Author details**

Erland Johansson\* and Anders B. Falk EJSelenkonsult AB, Uppsala, Sweden

\*Address all correspondence to: 101jejohansson@gmail.com

© 2022 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.
