1. Norwegian Institute for Water Research (NIVA) Oslo Norway
2. Norwegian University of Life Sciences (NMBU), Faculty of Environmental Sciences and Natural Resource Management (MINA), Ås Norway
3. Centre for Environmental Radioactivity, Norwegian University of Life Sciences (NMBU), Ås Norway
4. Institute of Environmental Toxicology, Huxley College of the Environment Western Washington University Bellingham Washington USA
5. Finnish Environment Institute (SYKE) Jyväskylä Finland