1. Dana-Farber Cancer Institute; Harvard Medical School; Boston MA USA
2. University College London Hospitals; London UK
3. University Medical Centre Utrecht; Utrecht the Netherlands
4. Ospedale Niguarda Ca' Granda; Milano Italy
5. Dartmouth-Hitchcock Medical Center; Lebanon NH USA
6. Memorial Sloan Kettering Cancer Center; New York NY USA
7. Policlinico San Matteo; Pavia Italy
8. Hospital Universitario de Salamanca; Salamanca Spain