1. Institute of Public Health and Clinical Nutrition, University of Eastern Finland , Kuopio, Finland
2. Department of Health Security, Finnish Institute for Health and Welfare , Kuopio and Helsinki, Finland
3. Finnish Institute of Occupational Health , Helsinki, Finland
4. Department of Public Health and Welfare, Finnish Institute for Health and Welfare , Helsinki, Finland
5. Department of Technical Physics, University of Eastern Finland , Kuopio, Finland
6. Department of Environmental and Biological Sciences, University of Eastern Finland , Kuopio, Finland