1. Department of Electrical Engineering and Computer Science, Cleveland State University, Cleveland, Ohio 44115, USA
2. Department of Electrical Engineering and Computer Engineering, University of Arizona, Tucson, AZ 87721, USA
3. Department of Mechanical Engineering, Cleveland State University, Cleveland, Ohio 44115, USA
4. Department of Electrical Engineering and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30313, USA
5. Motion Study Laboratory, Cleveland VA Medical Center, Cleveland, Ohio 44106, USA