1. International Agency for Research on Cancer (IARC/WHO), Section of Environment and Radiation, 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France
2. Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI), University Medical Center Mainz, Langenbeckstraβe 1, 55131 Mainz, Germany
3. School of Physics, Aristotle University of Thessaloniki, Thessaloniki 541 24, Greece