1. INFM, Department of Health Sciences, University of L’Aquila, Via Vetoio, Coppito 2, 67100 L’Aquila, Italy, Department of Biomedical Sciences and Technologies, University of L’Aquila, Via Vetoio, Coppito 2, 67100 L’Aquila, Italy, and INFM, Department of Physics, University of L’Aquila, Via Vetoio, Coppito 1, 67100 L’Aquila, Italy