1. Department of Experimental and Clinical Sciences; University of Brescia; 25125 Brescia Italy
2. Departament d'Informàtica; University of Valencia, Avinguda de la Universitat; 46100 Burjassot-València Spain
3. Centre for Research in Social Simulation; Department of Sociology; Faculty of Arts and Human Sciences, University of Surrey; Guilford GU2 7XH United Kingdom
4. Department of Economics and Management; University of Brescia; 25122 Brescia Italy