1. Institute of Human Nutrition and Food Science, University of Kiel, 24105 Kiel, Germany.
2. Corresponding author. Phone: 0049-431-597-3672. Fax: 0049-431-597-3679. E-mail: drieckhoff@nutrfoodsc.uni-kiel.de
3. Present address: Novartis Nutrition Research Unit, Maastricht, The Netherlands.
4. Cerefi Ltd, FIN-02160 Espoo, Finland.