1. School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, Bethnal Green, London E1 4NS, UK
2. Department of Electrical, Electronic and Telecommunication Engineering (DITEN), University of Genoa, Via All’Opera Pia, 15, 16145 Genoa, Italy
3. Piccolo Cottolengo Genovese di Don Orione, Via Benvenuto Cellini 22, 16143 Genova, Italy
4. Rehab Technologies Lab, Istituto Italiano di Tecnologia, Via Morego, 30, 16163 Genoa, Italy