1. Department of Clinical Chemistry and Laboratory Medicine, Saarland University Hospital, Homburg/Saar, Germany;
2. Aarhus Institute of Advanced Studies, University of Aarhus, Aarhus C, Denmark;
3. Nutritional CRO, BioTeSys GmbH, Esslingen, Germany;
4. Department of Mathematics, Natural and Economic Sciences, University of Applied Sciences Ulm, Ulm, Germany;
5. Department of Nutrition and Food Science, Rheinische Friedrich-Wilhelms University, Bonn, Germany;
6. Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria