1. Institute for Science and Technology in Medicine, Keele University, Keele, UK.
2. Mechanical Engineering Department, Cleveland State University, Cleveland, OH, USA.
3. Departments of Biomedical Engineering, Physical Medicine and Rehabilitation, and Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL, USA.
4. Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL, USA.
5. Research Service, Edward Hines, Jr. VA Hospital, Hines, IL, USA.