1. Institute for Preventive Medicine, Nutrition and Cancer, Fokhälsan Research Center and Department of Clinical Chemistry, University of Helsinki, Helsinki, Finland
2. Tokyo University of Agriculture, Tokyo, Japan
3. Department of Chemistry, University of Helsinki, Helsinki, Finland
4. Department of Pathology, University of Umeå, Umeå, Sweden
5. Department of Nutritional Research, University of Umeå, Umeå, Sweden
6. Department of Urology and Andrology, and Oncology, University of Umeå, Umeå, Sweden
7. Department of Food Science, Swedish University of Agricultural Sciences, Uppsala, Sweden.