1. Department of Preschool Education, University of Thessaly, Argonafton & Filellinon, 38221 Volos, Greece
2. Department of Education, University of the Aegean, Demokratias Av. 1, 85100, Rhodes, Greece
3. Department of Social and Educational Policy, Damaskinou and Kolokotroni str., Korinthos, Greece; Greek Center for Educational Research; Hellenic Open University