1 Division of Radiotherapy and Radiobiology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy.
2 Division of Radiotherapy and Radiobiology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy. giovanniluca.gravina@libero.it.
3 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA.
4 Department of Radiotherapy, Policlinico Umberto I "Sapienza" University of Rome, Rome, Italy.
5 Department Experimental Medicine, "Sapienza" University of Rome, Rome, Italy.
6 Department of System Medicine, University of Tor Vergata, 00133, Rome, Italy.