1. Department of Physical Medicine and Rehabilitation, Indiana University School of Medicine, Rehabilitation Hospital of Indiana, Indianapolis, Indiana, USA.
2. Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana, USA.
3. Department of Physical Medicine and Rehabilitation, The Ohio State University, Columbus, Ohio, USA.
4. Mental Health and Behavioral Sciences and Defense and Veterans Brain Injury Center, James A. Haley Veterans Hospital, Polytrauma TBI Rehabilitation, Tampa, Florida, USA.
5. Department of Internal Medicine, Division of Pulmonary and Sleep Medicine, University of South Florida, Tampa, Florida, USA.
6. Department of Physical Medicine and Rehabilitation, Mayo Clinic College of Medicine and Science, Mayo Clinic, Rochester, Minnesota, USA.
7. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Boston, Massachusetts, USA.
8. Department of Communication Sciences and Disorders, Northeastern University, Boston, Massachusetts, USA.
9. Department of Physical Medicine and Rehabilitation, Virginia Commonwealth University, Richmond, Virginia, USA.
10. Department of Physical Medicine and Rehabilitation, University of Virginia, Charlottesville, Virginia, USA.
11. Department of Physical Medicine and Rehabilitation, Edison, New Jersey, USA.