1. Section Endocrinology and Diabetology, University Obesity Centre Hamburg, University Hospital Hamburg-Eppendorf, Hamburg, Germany
2. Institute for Endocrinology & Diabetes, University of Lübeck, Department of Internal Medicine 1, Endocrinology & Diabetes, University of Lübeck, Lübeck, Germany
3. Nutrition Team/Nutrition Outpatient Clinic, University Hospital Leipzig, Leipzig, Germany
4. Medical Department III - Endocrinology, Nephrology, Rheumatology, University of Leipzig, Leipzig, Germany