1. Emory University Atlanta Georgia
2. University of Alberta Edmonton Canada
3. Mayo Clinic Rochester Minnesota
4. Amsterdam University Medical Centers Amsterdam the Netherlands
5. Leiden University Medical Center Leiden the Netherlands
6. University of Pittsburgh Pittsburgh Pennsylvania
7. University of California Davis Health System Sacramento California
8. University at BuffaloState University of New York Buffalo New York
9. Duke University Durham North Carolina
10. Memorial Sloan Kettering Cancer Center New York New York