1. Veterans Affairs Medical Center; Memphis TN USA
2. Department of Medicine; University of Tennessee Health Science Center; Memphis TN USA
3. Edward J. Hines; Jr. Veterans Affairs (VA) Hospital; Hines IL USA
4. Veterans Affairs (VA) Puget Sound Health Care System; Seattle WA USA
5. Department of Rehabilitation Medicine; University of Washington; Seattle WA USA
6. Durham Veterans Affairs Medical Center (VAMC); Durham NC USA
7. Veterans Affairs Medical Center; Houston TX USA
8. Department of Orthopedics; Baylor University; Houston TX USA
9. Stritch School of Medicine; Loyola University; Maywood IL USA