1. a institute of Advanced Biomedical Technologies, University of Chieti , Chieti , Italy
2. g E-mail:
3. b Department of Clinical Sciences and Biomedical Images , University of Chieti , Chieti , Italy
4. c Istituto di Cibernetica, Consiglio Nazionale delle Ricerche , Arco Felice , Italy
5. d Advanced Technologies Biomagnetics , Chieti , Italy
6. e Zentralinstitut für Biomedizinische Technik, University of Ulm , Ulm , Germany
7. f institute of Solid State Electronics, Consiglio Nazionale delle Ricerche , Rome , Italy