**Author details**

Silvia Nuere1 \*, Laura de Miguel Alvarez<sup>2</sup> and Raul Diaz-Obregon Cruzado1

1 Polytechnic University of Madrid (Universidad Politecnica de Madrid), Madrid, Spain

2 International University of La Rioja (UNIR), Madrid, Spain

\*Address all correspondence to: silvia.nuere@upm.es

© 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.
