1. Department of Kinesiology and Community Health, College of Applied Health Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
2. Centre National Hospitalier et Universitaire de Pneumo-Phtisiologie, Cotonou, Benin
3. Department of Physical Therapy and Rehabilitation Science, School of Health Professions, University of Kansas Medical Center, Kansas City, KS, USA
4. Illinois Multiple Sclerosis Research Collaborative, University of Illinois at Urbana Champaign, Urbana, IL, USA