1. Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire
2. Cleveland Clinic Foundation, Cleveland, Ohio
3. University of Texas Southwestern Medical Center, Dallas, Texas
4. University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
5. University of Alabama Birmingham, Birmingham, Alabama
6. Indiana University Health, Indianapolis, Indiana
7. Duke University Medical Center, Durham, North Carolina
8. Massachusetts General Hospital, Boston, Massachusetts
9. New York University Langone Medical Center, New York, New York
10. University of California-San Diego, San Diego, California
11. George Washington University Medical Center, Washington, D.C.
12. Johns Hopkins Medical Institutions, Baltimore, Maryland