1. Institute for Informatics and Telematics (IIT), National Research Council of Italy (CNR), 56124 Pisa, Italy
2. Department of Information Engineering, University of Pisa, 56124 Pisa, Italy
3. Department of Medicine and Health Sciences “Vincenzo Tiberio”, University of Molise, 86100 Campobasso, Italy
4. Department of Engineering, University of Sannio, 82100 Benevento, Italy