1. STUK - Radiation and Nuclear Safety Authority; Research and Environmental Surveillance; Helsinki Finland
2. School of Health Sciences; University of Tampere; Finland
3. International Agency for Research on Cancer, Section on Environment and Radiation; Lyon France
4. Finnish Cancer Registry; Helsinki Finland
5. Department of Mathematical Sciences; University of Oulu; Finland
6. National Institute for Health and Welfare; Unit of Environmental Epidemiology; Kuopio Finland