1. Department of Radiation Oncology; Vanderbilt University School of Medicine; Nashville TN 37232 USA
2. University of Minnesota; Minneapolis MN 55455 USA
3. Virginia Commonwealth University; Richmond VA 23284 USA
4. University of Iowa; Iowa City IA 52242 USA
5. Tri-State Regional Cancer Center; Ashland KY 41101 USA
6. University of Wisconsin; Madison WI 53715 USA
7. University of Colorado; Aurora CO 80045 USA
8. Mayo Clinic; Jacksonville FL 32224 USA
9. Rensselaer Polytechnic Institute; Troy NY 12180 USA
10. University of Pennsylvania; Philadelphia PA 19104 USA