1. Department of Nuclear Medicine, University of Ulm, Ulm, Germany.
2. Division of Endocrinology and Diabetes, RWTH Aachen, Aachen, Germany.
3. Department of Radiology, University of Ulm, Ulm, Germany.
4. Department of Nuclear Medicine, University of Würzburg, Würzburg, Germany.
5. Department of General, Visceral, and Vascular Surgery, University of Halle-Wittenberg, Halle, Germany.
6. Section for Radiochemistry, Max-Planck-Institut für neurologische Forschung, Köln, Germany.
7. Department of Nuclear Medicine, RWTH Aachen, Aachen, Germany.