1. Department of Neurology, Oregon Health & Science University, Portland, OR, USA
2. Department of Electrical and Computer Engineering, Portland State University, Portland, OR, USA
3. APDM, Inc., Portland, OR, USA
4. School of Public Health, Oregon Health & Science University–Portland State University, Portland, OR, USA
5. Department of Biomechanics, University of Nebraska at Omaha, Omaha, NE, USA