1. School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
2. School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
3. Department of Mechanical, Material and Manufacturing Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
4. Department of Informatics, Modelling, Electronics and System Engineering, University of Calabria, 87036 Rende, Italy