1. Unite des Maladies Metaboliques et Micronutrients, INRA Theix, 63122 Saint-Genes-Champanelle, France
2. UMR de Chimie Biologique, INRA-INAPG, Institut National Agronomique Paris-Grignon, 78850 Thiverval-Grignon, France
3. Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
4. Institute for Preventive Medicine, Nutrition, and Cancer, Folkhalsan Research Center, and Division of Clinical Chemistry, University of Helsinki, PL 63, FIN-00014, Helsinki, Finland