1. Division of Haematology and Oncology, Department of Internal Medicine IV, University Hospital Giessen and Marburg, Giessen, Germany.
2. Division of Endocrinology, Diabetes, and Metabolism, Department of Internal Medicine I, University Hospital Frankfurt, Frankfurt am Main, Germany.
3. Department of Endocrinology, Medical Research Center, Polish Academy of Science, Warsaw, Poland.
4. Department of Nuclear Medicine, Medical Center Zajecar, Zajecar, Serbia.