1. Department of Biology, Pisa University, Pisa, Italy
2. Department of Laboratory Medicine, Section of Medical Genetics, Telemark Hospital, Skien, Norway
3. Department of Aerospace Engineering, University of Naples Federico II, Naples, Italy
4. Environmental Health, Institute of Public Health, University of Copenhagen, Copenhagen, Denmark
5. New Technologies and Risks, Work Environment Development, Finnish Institute of Occupational Health, Helsinki, Finland
6. Unit of Molecular Epidemiology, National Cancer Research Institute, Genoa, Italy