**Author details**

Elena Fuentes1 \*, Sofia Alves1 , Ainara López-Ortega1 , Lucía Mendizabal1 and Virginia Sáenz de Viteri2

1 IK4-Tekniker, Eibar, Spain

2 Mugape, Mallabia, Spain

\*Address all correspondence to: elena.fuentes@tekniker.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.
