1. Department of Physical Medicine & Rehabilitation, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
2. Department of Kinesiology and Community Health, College of Applied Health Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
3. Interactive Media Technology Center, Georgia Institute of Technology, Atlanta, Georgia, USA
4. Department of Physical Therapy and Rehabilitation Science, School of Health Professions, University of Kansas Medical Center, Kansas City, Kansas USA
5. Center for Health, Aging and Disability, College of Applied Health Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA