Els següents fitxers sobre la llicència estan associats a aquest element:

© 2018 Published by Elsevier Ltd on behalf of IJS Publishing Group Ltd. This is an open access article
under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Except where otherwise noted, this item's license is described as © 2018 Published by Elsevier Ltd on behalf of IJS Publishing Group Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).