1. Department of Clinical Nutrition, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland
2. Food and Health Research Centre, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland
3. Department of Pharmacology and Toxicology, University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland
4. National Public Health Institute, Laboratory of Toxicology, P.O. Box 95, 70701 Kuopio, Finland
5. Centre for Epidemiology and Biostatistics, Molecular Epidemiology Unit, LIGHT Laboratories, University of Leeds, LS2 9JT Leeds, United Kingdom