1. University of Southern California, Los Angeles, California
2. University of Oklahoma, Oklahoma City, Oklahoma
3. University of Texas Southwestern Medical Center, Dallas, Texas
4. Ohio State University, Columbus, Ohio
5. Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, Pennsylvania
6. University of North Carolina, Chapel Hill, North Carolina
7. University of Wisconsin, Madison, Wisconsin
8. New York University School of Medicine, New York, New York
9. Veterans Affairs Medical Center, Houston, Texas
10. University of Iowa, Iowa City, Iowa
11. Johns Hopkins University, Baltimore, Maryland
12. Columbia University Medical Center, New York, New York
13. University of Chicago, Chicago, Illinois
14. University of Texas M. D. Anderson Cancer Center, Houston, Texas
15. Vanderbilt University, Nashville, Tennessee
16. University of Minnesota, Minneapolis, Minnesota
17. Montefiore Medical Center, Bronx, New York
18. Cleveland Clinic, Cleveland, Ohio