1. University of Athens, Athens, Greece;
2. Mayo Clinic, Rochester, MN;
3. Hopital St Louis, Paris, France;
4. University of Salamanca, Salamanca, Spain;
5. Roswell Park Cancer Center, Buffalo, NY;
6. Wilhelminen Hospital, Vienna, Austria;
7. Bosch Institute, Camperdown, Australia;
8. Robert H. Lurie Comprehensive Cancer Center, Chicago, IL;
9. Universitaire de Nantes, Nantes, France;
10. Ankara University-Ibn Sina Hospital, Ankara, Turkey;
11. Dana-Farber Cancer Institute, Boston, MA;
12. University of Heidelberg, Heidelberg, Germany;
13. University of Torino, Torino, Italy;
14. M. D. Anderson Cancer Center, Houston, TX;
15. Boston Veterans Administration Healthcare System, West Roxbury, MA; and
16. Mt Sinai Medical Center, New York, NY