1. Institute of Life Course and Medical Sciences, University of Liverpool 1 Department of Musculoskeletal and Ageing Science , , William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX , UK
2. Département d'Informatique, Université de Poitiers 2 , 86073 Poitiers Cedex 9 , France
3. The Medical Research Council Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA) 3 , Institute of Life Course and Medical Sciences, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX , UK
4. School of Engineering, University of Liverpool 4 Department of Mechanical, Materials and Aerospace Engineering , , Liverpool L69 3GH , UK
5. School of Computer Science and Mathematics, Faculty of Engineering and Technology, Liverpool John Moores University 5 , Byrom Street, Liverpool L3 3AF , UK