1. 1Departments of Endocrinology, Diabetology and Metabolism, University Hospital Basel, Basel, Switzerland
2. 2 Department of Clinical Research, University of Basel, Basel, Switzerland
3. 3Division of Endocrinology and Diabetes, Department of Internal Medicine I, University Hospital, University of Würzburg, Würzburg, Germany
4. 4Central Laboratory, University Hospital Würzburg, Würzburg, Germany
5. 5Department of Endocrinology and Nephrology, University of Leipzig, Leipzig, Germany
6. 6Leipzig University Medical Center, IFB AdiposityDiseases, Leipzig, Germany