1. Faculty of Spatial Sciences, Department of Economic Geography; University of Groningen; Groningen the Netherlands
2. Department of Economics, Statistics and Finance; University of Calabria; Rende Italy
3. Department of Social and Economic Sciences; Sapienza University of Rome; Rome Italy
4. Faculty of Economics and Business, Department of Economics, Econometrics & Finance; University of Groningen; the Netherlands
5. Gran Sasso Science Institute (GSSI); Social Science Evaluation Unit; L'Aquila Italy