1. Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, U.K.
2. Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, U.K.
3. Sir Peter Mansfield Imaging Centre and Mental Health & Clinical Neurosciences, School of Medicine, University of Nottingham, Nottingham, U.K.