1. Department of Linguistics and Basque Studies, Centro de Investigación Micaela Portilla, University of the Basque Country- UPV/EHU, Vitoria-Gasteiz, Spain
2. Ikerbasque Foundation of Science/ Department of Linguistics and Basque Studies, Centro de Investigación Micaela Portilla, Ikerbasque Foundation of Science/University of the Basque Country - UPV/EHU, Vitoria-Gasteiz, Spain