1. Department of Nutrition and Food ScienceNutritional PhysiologyUniversity of Bonn Bonn 53113 Germany
2. Institute of Clinical Chemistry and Clinical PharmacologyUniversity Hospital Bonn Bonn 53127 Germany
3. Clinical Study Core Unit, Study Center BonnInstitute of Clinical Chemistry and Clinical PharmacologyUniversity Hospital Bonn Bonn 53127 Germany
4. Institute of Medical BiometryInformatics and EpidemiologyUniversity Hospital Bonn Bonn 53127 Germany
5. Novo Nordisk Foundation Center for Basic Metabolic Research and Department for Biomedical SciencesUniversity of Copenhagen Copenhagen 2200 Denmark
6. Institute of Nutritional MedicineUniversity of Hohenheim Stuttgart 50599 Germany