1. Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL 60611
2. Center for Locomotion Studies, Penn State University, University Park, PA 16802
3. Department of Engineering Science and Mechanics, Penn State University, University Park, PA 16802
4. Center for Locomotion Studies; Department of Kinesiology, Penn State University, University Park, PA 16802
5. Department of Kinesiology, Penn State University, University Park, PA 16802