[1] UNIV PISA,DIPARTIMENTO BIOMED ENGN,I-56100 PISA,ITALY
[2] INFN,PISA,ITALY
[3] UNIV NAPOLI FEDERICO,DIPARTIMENTO SCI FIS,NAPLES,ITALY
[4] UNIV FERRARA,DIPARTIMENTO FIS,I-44100 FERRARA,ITALY
[5] INFN,FERRARA,ITALY
[6] UNIV CAGLIARI,IST FIS MED,I-09100 CAGLIARI,ITALY
[7] INFN,CAGLIARI,ITALY
[8] UNIV NAPOLI FEDERICO II,DIPARTIMENTO INFORMAT & SISTEMIST,NAPLES,ITALY
[9] INFN,NAPLES,ITALY