1. Institute for Clinical Chemistry and Pathobiochemistry, Department for
Diagnostic Laboratory Medicine, University Hospital Tübingen,
Germany
2. Institute for Diabetes Research and Metabolic Diseases of the Helmholtz
Center Munich at the University of Tübingen, Germany
3. German Center for Diabetes Research (DZD), München-Neuherberg,
Germany
4. Institute of Laboratory Medicine, Vinzenz von Paul Kliniken gGmbH,
Stuttgart, Germany
5. Department of Internal Medicine IV, Division of Endocrinology,
Diabetology and Nephrology, University of Tübingen,
Germany