Affiliation: | 1. Imperial College London, Department of Computing, London SW7 2AZ, UK;2. University of Nottingham, School of Computer Science, Nottingham NG8 1BB, UK;3. University of Nottingham, School of Medicine, Nottingham NG7 2UH, UK;1. West Virginia University,PO Box 6201, Morgantown, WV 26506, United States;2. IRML, NCSR Demokritos,GR-15310 Aghia Paraskevi, Attiki, Greece |