1. Istituto di Bioimmagini e Fisiologia Molecolare-Consiglio Nazionale delle Ricerche (IBFM-CNR), Cefalù (PA), Italy
2. National Institute for Nuclear Physics, Laboratori Nazionali del Sud, INFN-LNS, Catania, Italy
3. Department of Biopathology and Medical Biotechnology, Palermo University, Palermo, Italy
4. Department of Physics, University of Naples Federico II, via Cintia, Naples, Italy
5. Nuclear Medicine, San Raffaele Scientific Institute, Milan, Italy