1. Department of Physical Medicine and Rehabilitation (PM&R), Virginia Commonwealth University , Richmond, VA 23284-0667, USA
2. Division of Epidemiology, Department of Internal Medicine, University of Utah , Salt Lake City, UT 84108, USA
3. Department of Rehabilitation Medicine, Thomas Jefferson University Sidney Kimmel Medical College , Philadelphia, PA 19107, USA
4. Sheltering Arms Institute , Richmond, VA 23233, USA
5. Mental Health Service, Central Virginia VA Health Care System , Richmond, VA 23249, USA
6. VA Salt Lake City IDEAS Center for Innovation and Department of Internal Medicine, University of Utah School of Medicine , Salt Lake City, UT 84312, USA
7. Research Service Line, Washington DC VA Medical Center , Washington, DC 20422, USA
8. Research & Academic Affairs Service Line, W. G. (Bill) Hefner VA Healthcare System , Salisbury, NC 28144, USA
9. Department of Physiology and Pharmacology, Wake Forest School of Medicine , Winston-Salem, NC 27157, USA
10. George E. Wahlen VA Salt Lake City Healthcare System , Salt Lake City, UT 84148, USA
11. Department of Neurology, University of Utah , Salt Lake City, UT 84132, USA
12. H. Ben Taub Department of Physical Medicine and Rehabilitation, Baylor College of Medicine , Houston, TX 77030, USA
13. Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
14. National Intrepid Center of Excellence, Walter Reed National Military Medical Center , Bethesda, MD 20814, USA
15. Department of Psychology, Virginia Commonwealth University , Richmond, VA 23284, USA
16. Michael E. DeBakey Veterans Affairs Medical Center , Houston, TX 77030, USA
17. Department of Pediatrics, University of Utah , Salt Lake City, UT 84108, USA
18. PM&R Service, Richmond Veterans Affairs Medical Center , Richmond, VA 23249, USA