1. Cancer Research Center, Boston University School of Medicine, Boston, MA;
2. Hospital Necker, Paris, France;
3. Memorial-Sloan Kettering, New York, NY;
4. Beth Israel-Deaconess Hospital, Boston, MA;
5. Yale School of Medicine, New Haven, CT;
6. Brigham and Women's Hospital, Boston, MA;
7. Istituto Tumori Nazionale, Milan, Italy
8. Children's Hospital, Hannover Medical School, Germany;