1. Department of Physiology, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland
2. Department of Food Science, Swedish University of Agricultural Sciences (SLU), SE-750 07 Uppsala, Sweden
3. Department of Clinical Nutrition, and Institute of Applied Biotechnology, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland