1. Institute of Public Health and Clinical Nutrition, Food and Health Research Centre, University of Eastern Finland, P.O. Box 1627, FIN-70211 Kuopio, Finland
2. Department of Plant Sciences, Weizmann Institute of Science, P.O. Box 26, 76100 Rehovot, Israel
3. VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Finland