1 Rehabilitation Engineering Lab, Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Champaign, IL, United States.
2 Department of Physical Therapy, National Cheng Kung University, Tainan, Taiwan.
3 Department of Biomedical Engineering, Xi'an Technological University, Xi'an, China.
4 Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.
5 Singapore-ETH Centre, Future Health Technologies Program, CREATE Campus, Singapore, Singapore.