1. Department of Mechanical Engineering University of Delaware Newark Delaware USA
2. Biomechanics and Movement Science University of Delaware Newark Delaware USA
3. Department of Physical Therapy University of Delaware Newark Delaware USA
4. Physical Therapy Program, Department of Physical Medicine and Rehabilitation University of Colorado Aurora Colorado USA
5. Eastern Colorado VA Geriatric Research Education and Clinical Center (GRECC) Aurora Colorado USA
6. Department of Biomedical Engineering University of Delaware Newark Delaware USA
7. Kinesiology and Applied Physiology University of Delaware Newark Delaware USA
8. Department of Radiology and Imaging Hospital for Special Surgery New York New York USA