1. Department of Electronics, Computer Sciences and Systems, and Health Sciences and Technologies Interdepartmental, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
2. Department of Electronics, Computer Sciences and Systems, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
3. INAIL Prostheses Centre, Via Rabuina, 14, 40054 Vigorso di Budrio (IT), Italy