1. Department of Radiation Physics; The University of Texas MD Anderson Cancer Center; Houston Texas U.S.A.
2. The University of Texas; Graduate School of Biomedical Sciences at Houston; Houston Texas U.S.A.
3. Department of Physics and Astronomy; Louisiana State University; Baton Rouge Louisiana U.S.A.
4. Radiation Oncology; Mayo Clinic; Rochester Minnesota U.S.A.
5. Department of Biomathematics; The University of Texas MD Anderson Cancer Center; Houston Texas U.S.A.
6. Mary Bird Perkins Cancer Center; Baton Rouge Louisiana U.S.A.