1. Department of Internal Medicine, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen, Tübingen, Germany;
2. Section on Experimental Radiology, University of Tübingen, Tübingen, Germany;
3. Department of General, Visceral and Transplant Surgery, University of Tübingen, Tübingen, Germany.