1. Department of Diagnostic Imaging (Radiology) and Nuclear Medicine, University Hospital San Pedro and Centre for Biomedical Research of La Rioja (CIBIR), Logroño, La Rioja
2. Department of Pathology, University Hospital “Marqués de Valdecilla,” Santander, Spain
3. Department of Nuclear Medicine, University of Duisburg-Essen and German Cancer Consortium (DKTK)–University Hospital Essen, Essen, Germany
4. IRCCS AOU di Bologna, Bologna, Italy
5. Nuclear Medicine and Diagnostic Imaging Section, Division of Human Health, Department of Nuclear Sciences and Applications, International Atomic Energy Agency (IAEA), Vienna, Austria.