1. Department of Linguistics and Basque Studies, Universidad del País Vasco / Euskal Herriko Unibertsitatea (UPV/EHU), Vitoria-Gasteiz, Spain
2. Departamento de Filosofía, Universidad de Valladolid, Valladolid, Spain
3. Department of Theoretical and Applied Linguistics, University of Cambridge, Cambridge, UK
4. Ikerbasque, Basque Foundation for Science, Bilbao, Spain