1. Department of Mathematics and Computer Science, University of Catania, 95125 Catania, Italy; Department of Educational Sciences, Section of Psychology, University of Catania, 95123 Catania, Italy
2. Department of Educational Sciences, Section of Psychology, University of Catania, 95123 Catania, Italy; Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, 95121 Catania, Italy