1. Faculty of Engineering and Architecture, Kore University of Enna, Cittadella Universitaria, Enna, Italy
2. Department of Economics and Statistics, University of Udine, Udine, Italy
3. Department of Agriculture, Food and Environment (Di3A), University of Catania, Catania, Italy
4. Institute for a Secure and Sustainable Environment, University of Tennessee, Knoxville, Tennessee, USA