1. Polytrauma Rehabilitation Center South Texas Veterans Health Care System; San Antonio TX USA
2. University of Texas Health Science Center San Antonio, Department of Rehabilitation Medicine; San Antonio TX USA
3. University of Texas Health Science Center San Antonio, Department of Psychiatry; San Antonio TX USA
4. Edith Nourse Rogers Memorial Hospital (The Center for Health Quality, Outcomes and Economic Research [CHQOER]); Bedford MA USA
5. South Texas Veterans Health Care System; San Antonio TX USA
6. University of Texas Health Science Center San Antonio, Department Of Epidemiology & Biostatistics; San Antonio TX USA