1. Shepherd Center, Atlanta, GA, USA
2. University of Georgia, Athens, GA, USA
3. University of Florida, Gainesville, FL, USA
4. Medical University of South Carolina, Charleston, South Carolina, USA
5. Northwestern University and Rehabilitation Institute of Chicago, Chicago, IL, USA
6. Baylor College of Medicine, Houston, TX, USA
7. Harris Health System, Houston, TX, USA
8. TIRR Memorial Hermann, Houston, TX, USA
9. Centers for Disease Control and Injury Prevention, Atlanta, GA, USA