1 Section of Nuclear Medicine and Health Physics, Department of Medicine and Surgery, Università degli Studi di Perugia, Perugia, Italy. Electronic address: barbara.palumbo@unipg.it.
2 Department of Engineering, Università degli Studi di Perugia, Perugia, Italy.
3 Section of Radiotherapy, Department of Medicine and Surgery, Università degli Studi di Perugia, Perugia, Italy.
4 Unit of Nuclear Medicine, Department of Medical, Surgical and Experimental Sciences, Università degli Studi di Sassari, Sassari, Italy.