1. The University of Texas MD Anderson Cancer Center, Houston, TX
2. Carolinas Healthcare System-Neuroscience Institute, Charlotte, NC
3. Mayo Clinic, Rochester, MN
4. Penn State Hershey Medical Center, Hershey, PA
5. Alliance Statistics and Data Center, Mayo Clinic, Rochester, MN
6. Massachusetts General Hospital, Boston, MA
7. Mercy Cancer Ctr, Des Moines, IA
8. Levine Cancer Institute-Radiation Oncology, Charlotte, NC
9. Princess Maraget Hospital, Toronto, ON, Canada
10. Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
11. Novant Health Forsyth Medical Center, Winston Salem, NC
12. Mayo Clinic Florida, Jacksonville, FL