1. Department of Electrical, Electronic, and Information Engineering “G. Marconi” DEI, University of Bologna, Bologna, Italy
2. Department of Computer Science and Engineering, University of Bologna, Bologna, Italy
3. Department of Mathematics and Computer Science, St. John’s University, Queens, NY, USA
4. Department of Engineering, University of Ferrara, Ferrara, Italy
5. HCS (Hybrid-Cloud Services) Department, IBM Consulting, Yorktown Heights, NY, USA
6. Department of Mathematics and Computer Science, University of Ferrara, Ferrara, Italy