1. NILU, Fram Centre, Tromsø NO-9296, Norway
2. Department of Community Medicine, UiT─the Arctic University of Norway, Tromsø NO-9037, Norway
3. Department of Environmental Science, Stockholm University, Stockholm SE-10691, Sweden
4. Helmholtz Centre for Environmental Research─UFZ, Leipzig DE-04103, Germany
5. Norwegian Institute for Public Health, Oslo NO-0213, Norway