1. Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
2. Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
3. Department of Biochemistry and Molecular Medicine, University of California, Davis, Davis, California 95616, United States
4. Foods for Health Institute, University of California, Davis, Davis, California 95616, United States