1. National Council on Radiation Protection and Measurements, Bethesda, MD, USA;
2. Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center and Vanderbilt-Ingram Cancer Center, Nashville, TN, USA;
3. EpidStat Institute, Ann Arbor, MI, USA;
4. International Epidemiology Institute, Rockville, MD, USA;
5. Oak Ridge Associated Universities, Oak Ridge, TN, USA