1. Department of Epidemiology; University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
2. Physical Medicine & Rehabilitation; University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
3. Safar Center for Resuscitation Research; University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
4. Department of Neuroscience; University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
5. Center for Neuroscience at University of Pittsburgh; Pittsburgh Pennsylvania U.S.A
6. South Texas Veterans Health Care System Polytrauma Rehabilitation Center; San Antonio Texas U.S.A
7. Department of Epidemiology and Biostatistics; University of Texas Health Science Center San Antonio; San Antonio Texas U.S.A
8. Department of Physical Medicine & Rehabilitation; Virginia Commonwealth University; Richmond Virginia U.S.A
9. Department of Neurology; UAB Epilepsy Center; University of Alabama at Birmingham; Birmingham Alabama U.S.A
10. Spaulding Rehabilitation Hospital; Harvard Medical School; Boston Massachusetts U.S.A
11. Department of Physical Medicine and Rehabilitation; Mayo Clinic; Rochester Minnesota U.S.A
12. Carolinas Rehabilitation; Charlotte North Carolina U.S.A
13. Indiana University School of Medicine; Indianapolis Indiana U.S.A
14. Rusk Rehabilitation; New York University School of Medicine; New York New York U.S.A
15. Miller School of Medicine; University of Miami; Miami Florida U.S.A
16. Department of Physical Medicine and Rehabilitation; Ohio State University; Columbus Ohio U.S.A
17. Department of Rehabilitation Medicine; Icahn School of Medicine at Mount Sinai; New York New York U.S.A
18. Departments of Physical Medicine and Rehabilitation and Ophthalmology; The University of Alabama at Birmingham; Birmingham Alabama U.S.A