1. University Hospital, University of Würzburg, Department of Internal Medicine I, Division of Endocrinology/Diabetology, Würzburg, Germany
2. Endocrine Practice; Heidelberg, Germany
3. University Hospital, University of Magdeburg, Department of Nuclear Medicine, Magdeburg, Germany
4. University Hospital, Ludwig-Maximilians University of Munich, Department of Internal Medicine IV, Munich, Germany
5. University Hospital, University of Würzburg, Comprehensive Cancer Center Mainfranken, Würzburg, Germany