1. Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo, Japan;
2. University of Eastern Finland, Kuopio, Finland;
3. STUK – Radiation and Nuclear Safety Authority, Helsinki, Finland;
4. Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, MA, U.S.A.;
5. National Council on Radiation Protection and Measurements, Bethesda, MD, U.S.A.;
6. Department of Medicine and Vanderbilt-Ingram Cancer Centre, Vanderbilt University School of Medicine, Vanderbilt University, Nashville, TN, U.S.A.