1. School of Computing, University of Leeds, Leeds, U.K.
2. Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, U.K.
3. Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield, U.K.
4. Leeds Teaching Hospitals NHS Trust, Leeds, U.K.
5. Christabel Pankhurst Institute, Division of Informatics, Imaging and Data Sciences, University of Manchester, Manchester, U.K.
6. Institute of Rehabilitation Engineering, Binzhou Medical University, Yantai, China