In the above article [1], the paragraph of support information, sponsor, and financial support acknowledgment should read “This work was supported in part by the European Regional Development Fund (ERDF) and the Spanish Ministerio de Ciencia, Innovacioìn y Universidades under Project TEC2017-85376-C2-1-R and Project TEC2017-85376-C2-2-R, in part by the ERDF and the Galician Regional Government as part of the agreement for funding the Atlantic Research Center for Information and Communication Technologies (AtlantTIC), and in part by the ERDF and the Extremadura Regional Government under Project IB18073 and Project GR18055.”
