1. Laboratory of Biomechatronics and Intelligent Robotics, Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA
2. Laboratory of Biomechatronics and Intelligent Robotics, Enschede, The Netherlands
3. Functional and Applied Biomechanics Section, Rehabilitation Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
4. Department of Mechanical and Aerospace Engineering, University at Buffalo, Buffalo, NY, USA