C Norman Coleman1, Bruce D Minsky2. 1. Radiation Research Program, National Cancer Institute, National Institutes of Health, 9609 Medical Center Drive, Bethesda, MD 20892-9727, USA; International Cancer Expert Corps, New York, NY, USA. Electronic address: ccoleman@mail.nih.gov. 2. Division of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA.