1. Division of Endocrinology & Diabetology, Department of Gastroenterology, Endocrinology and Metabolism, University Hospital of Giessen and Marburg – Philipp's University, Marburg, Germany
2. Diabetology Marburg, Marburg, Germany
3. Division of Vascular Surgery and Transplantations, Department of Visceral, Thoracic and Vascular Surgery, University Hospital of Giessen and Marburg – Philipp's University, Marburg, Germany
4. Diabetes Clinic Bad Nauheim, Bad Nauheim, Germany
5. Department of Medicine II, Hospital of Darmstadt, Germany