1Department of Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
2Central Laboratory/Clinical Chemistry and Pathobiochemistry, University Hospital Tübingen, Tübingen, Germany
3Paul Langerhans Institute Tübingen (Inst. for Diabetes Research and Metabolic Diseases of the Helmholtz Centre Munich at the University of Tübingen), Tübingen, Germany
4Department of Internal Medicine IV, University of Tübingen, Tübingen, Germany
5Department of Pharmacology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
6Department of Molecular Epidemiology, German Institute of Human Nutrition Potsdam-Rehbruecke, Nuthetal, Germany
7Molecular Epidemiology Group, Max Delbrück Center for Molecular Medicine (MDC), Berlin-Buch, Germany