1. Clinic and Policlinic of Nuclear Medicine, University Hospital Würzburg, Germany
2. Department of Radiology, University Hospital Regensburg, Germany
3. Centre for Clinical Studies, University Hospital Regensburg, Germany
4. University Clinic and Policlinic of Radiology, Martin Luther University Hospital Halle-Wittenberg, Halle (Saale), Germany
5. Department of Clinical Radiology, University Hospital Münster, Germany