1. University Hospital, LMU Munich, Department of Internal Medicine IV, Munich, Germany,
2. University Hospital Frankfurt Goethe University, Department of Internal Medicine 1, Frankfurt am Main, Germany, ;
3. University Hospital of Munich, LMU Munich, Department of Internal Medicine IV, Marchionini Str. 15, Munich, Germany, 81377, ;
4. University of Würzburg, 9190, Department of Internal Medicine I, Division of Endocrinology/Diabetology, Oberdürrbacherstr. 6, 97080 Würzburg, Wurzburg, Bayern, Germany, 97080, ;
5. University Hospital Marburg, Department of Nuclear Medicine, Marburg, Germany, ;
6. University Hospital of Marburg, Department of Nuclear Medicine, Marburg, Germany, ;
7. Univeristy Hospital Marburg, Department of Nuclear Medicine, Marburg, Germany, ;
8. University of Augsburg, Nuclear Medicine, Medical Faculty, Augsburg, Germany, ;
9. University Hospital Leipzig, 39066, Department of Internal Medicine III, Leipzig, Germany, ;
10. University Hospital of Leipzig, Department of Visceral-, Transplant-, Thoracic and Vascular Surgery, Leipzig, Germany, ;
11. University of Würzburg, Department of Internal Medicine I, Division of Endocrinology/Diabetology, Würzburg, Germany, ;
12. University Hospital Magdeburg, 39067, Division of Nuclear Medicine, Department of Radiology and Nuclear Medicine, Magdeburg, Germany, ;
13. LMU Munich, Institute for Medical Information Processing, Biometry and Epidemiology, Munich, Germany, ;
14. University Hospital of Düsseldorf, Division for Specific Endocrinology, Medical Faculty, Duesseldorf, Germany, ;
15. University of Düsseldorf, Division for Specific Endocrinology, Medical Faculty,, Dueseldorf, Germany, ;
16. University Hospital, LMU Munich, Department of Nuclear Medicine, Munich, Germany, ;
17. University Hospital Würzburg, Department of Internal Medicine I, Division of Endocrinology/Diabetology, Würzburg, Germany, ;
18. University Hospital, LMU Munich, Department of Internal Medicine IV, Munich, Germany, ;