1. VA North Texas, Dallas, Texas.
2. Harvard School of Public Health, Cambridge, Massachusetts.
3. University of Pennsylvania, Philadelphia, Pennsylvania.
4. University of Alabama at Birmingham, Birmingham, Alabama.
5. Case Western School of Medicine, Cleveland, Ohio.
6. University of California Los Angeles, Los Angeles, California.
7. Oregon Health and Science University, Portland, Oregon.
8. Johns Hopkins University, Baltimore, Maryland.
9. Northwestern University, Chicago, Illinois.