1. Health Services Research and Development Service, Department of Veterans Affairs, Center of Innovation for Complex Chronic Healthcare (CINCCH), Hines, Illinois, USA
2. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
3. Department of Spinal Cord Injury, VA Boston Healthcare System, West Roxbury, Massachusetts, USA
4. Harvard Medical School, Spaulding Rehabilitation Hospital, Boston, Massachusetts, USA
5. Department of Physiotherapy and Rehabilitation, Faculty of Health and Welfare, Satakunta University of Applied Sciences, Pori, Finland
6. Department of Orthopaedics, Medical College of Georgia at Augusta University, Augusta, Georgia, USA
7. Charlie Norwood Veterans Administration Medical Center, Augusta, Georgia, USA
8. Department of Medicine, Division of Rheumatology, Medical College of Georgia at Augusta University, Augusta, Georgia. USA
9. Public Health Sciences, Parkinson School of Health Sciences and Public Health, Loyola University, Maywood, Illinois, USA