1. Department of Radiology & Medical Physics, Memorial Sloan Kettering Cancer Center, New York, NY, USA;
2. Department of Epidemiology & Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA;
3. Memorial Sloan Kettering Cancer Center, New York, NY, USA;
4. Oak Ridge National Laboratory, Oak Ridge, TN, USA;
5. Landauer, Inc. (retired), Glenwood, IL, USA;
6. National Council on Radiation Protection and Measurements, Bethesda, MD, USA;
7. Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA