Open access content

The original source from which we used only the text and we transformed it to audible materiasl with respect and application of  the re-use  conditions, is the cited article ( link provided ) and is licensed under a Creative Commons Attribution 4.0 International License, which permits  to share and adapt and distribute the materials, with the conditions of giving appropriate credit to the original source, indicate if changes were made. In addition, providing a link to the Creative Commons licence. http://creativecommons.org/licenses/by/4.0/.