1. Department of Electrical and Electronic Engineering, University of Nottingham, Nottingham, U.K
2. Faculty of Information Technology and Communication Sciences, Tampere University, Tampere, Finland
3. School of Engineering, Newcastle University, Newcastle upon Tyne, U.K
4. Monumo Ltd., Cambridge, U.K
5. Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy