1. VA Medical Center Washington District of Columbia USA
2. Rutgers School of Dental Medicine Newark New Jersey USA
3. VA Medical Center San Francisco California USA
4. Audie L. Murphy Division South Texas Veterans Health Care System San Antonio Texas USA
5. VA Medical Center Danville Illinois USA
6. VA Medical Center Atlanta Georgia USA
7. VA Medical Center Durham North Carolina USA
8. VA Medical Center San Antonio Texas USA
9. National Cancer Institute Bethesda Maryland USA