1 Erratum to: Univ Access Inf Soc DOI 10.1007/s10209-013-0288-1

This erratum is published following a request signed by Javier Yanguas, Cristina Buiza, Mari Feli Gonzalez, Aitziber Etxaniz, Eduardo Carrasco and Gorka Epelde (as co-authors), as well as Javier Yanguas (as Scientific Director of INGEMA) and Jorge Posada (as Scientific Director of Vicomtech). Ingema and Vicomtech as Institutions, as well as the signing researchers who confirm that Vicomtech researchers Eduardo Carrasco and Gorka Epelde should appear as co-authors of the original published article. The article describes and analyzes results from collaborative research work of the two centers.