Laura Evangelista1, Pierpaolo Alongi2, Orazio Schillaci3. 1. Nuclear Medicine Unit, Department of Medicine (DIMED), University of Padua, Padua, Italy. 2. Nuclear Medicine Unit, Fondazione Istituto G.Giglio, Cefalu, Italy. 3. Nuclear Medicine Unit, Department of Biomedicine and Prevention, University of Tor Vergata, Rome, Italy.