1. Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot, Oxon OX11 0RQ, United Kingdom
2. Bundeswehr Institute of Radiobiology, Munich, Bavaria, 80937, Germany
3. Bundesamt fuer Strahlenschutz, Germany
4. Centro Studi e Ricerche di Sanita'e Veterinaria, Italy
5. Research Unit of Radiation Cytogenetics, Helmholtz Zentrum München, Germany