1. Department of Medicine, Surgery and Pharmacy, University of Sassari, Sassari, Italy
2. Department of Biomedical Sciences, University of Sassari, Sassari, Italy
3. Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Sassari, Italy
4. Department of Translational Medicine and New Technologies in Medicine and Surgery, Retrovirus Centre, University of Pisa, Pisa, Italy
5. CISUP – Centre for Instrumentation Sharing – University of Pisa, Pisa, Italy
6. Center for Biotechnology, College of Science and Technology, Sbarro Institute for Cancer Research and Molecular Medicine, Temple University, Philadelphia, PA, USA