1. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA
2. General Robotics, Automation, Sensing & Perception Laboratory, Department of bioengineering, Rehabilitation Robotics Laboratory, University of Pennsylvania, Philadelphia, PA
3. Department of Bioengineering, Rehabilitation Robotics Laboratory, University of Pennsylvania, Philadelphia, PA
4. Department of Physical Medicine and Rehabilitation, University of Pennsylvania, Philadelphia, PA