1Centre for Musculoskeletal Research, Griffith Health Institute, Griffith University, Southport, QLD, Australia
2Bernstein Center for Computational Neuroscience, Georg-August University, Göttingen, Germany
3Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
4Department of Mechanical & Aerospace Engineering, University of Florida, Gainesville, FL, USA
5Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
6Department of Orthopedics & Rehabilitation, University of Florida, Gainesville, FL, USA
7Department of Mechanical Engineering, Stanford University, Stanford, CA, USA
8Department of Mechanical Engineering, University of Melbourne, Melbourne, VIC, Australia
9Shiley Center for Orthopedic Research & Education at Scripps Clinic, La Jolla, CA, USA