1. Institute of Medical Science, University of Toronto, Toronto, ON M5S-1A8, Canada;
2. Martin Orthopaedic Biomechanics Lab, St. Michael's Hospital, Toronto, ON M5B-1W8, Canada
3. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B-2K3, Canada
4. Martin Orthopaedic Biomechanics Lab, St. Michael's Hospital, Toronto, ON M5B-1W8, Canada;
5. Faculty of Medicine, University of Toronto, Toronto, ON M5S-1A8, Canada
6. Martin Orthopaedic Biomechanics Lab, St. Michael's Hospital, Li Ka Shing Building (West Basement, Room B116), 209 Victoria Street, Toronto, ON M5B-1W8, Canada;
7. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B-2K3, Canada e-mail: