1. Department of Physics and Astronomy (DIFA), University of Bologna, Bologna, Italy
2. Department of Computer Science, Sapienza University of Rome, Rome, Italy
3. Department of Electrical and Information Technology Engineering (DIETI), University of Naples “Federico II”, Naples, Italy
4. Department of Science and Technology (DIST), University of Naples “Parthenope”, Naples, Italy
5. Department of Computer Science, University of Salerno, Salerno, Italy