1. Massachusetts General Hospital Cancer Center Boston Massachusetts USA
2. Harvard Medical School Boston Massachusetts USA
3. Memorial Sloan Kettering Cancer Center New York New York USA
4. Weill Cornell Medical College New York New York USA
5. The University of Texas MD Anderson Cancer Center Houston Texas USA
6. Sidney Kimmel Comprehensive Cancer Center Johns Hopkins University Baltimore Maryland USA
7. Hospital Universitari I Politecnic La Fe Valencia Spain
8. Gustave Roussy Villejuif France