1. 1 Department of Psychological and Educational Sciences, University of Palermo, Palermo, Italy
2. 2 Istituto per le Tecnologie Didattiche, Consiglio Nazionale delle Ricerche, Palermo, Italy
3. 3 Addictive and Compulsive Behaviours Laboratory, Institute for Health and Behaviours, University of Luxembourg, Esch-sur-Alzette, Luxembourg
4. 4 Faculty of Human and Social Sciences, UKE – Kore University of Enna, Enna, Italy