The following license files are associated with this item:

    © 2021 AEDV. Publicado por Elsevier Espana, S.L.U. Este es un artículo Open Access bajo la licencia CC BY-NC-ND (http://creativecommons.org/licenses/by-nc-nd/4.0/).
    Except where otherwise noted, this item's license is described as https://creativecommons.org/licenses/by-nc-nd/4.0/