1. Departments of Surgical and Biomedical Sciences (A.F., M.V.D., P.M., G.F.), University of Verona, 37129 Verona, Italy
2. Department of Internal Medicine (A.D., F.M.), University of Pisa, 56126 Pisa, Italy
3. Morphological and Biomedical Sciences (E.D., F.B., M.F.), University of Verona, 37129 Verona, Italy
4. Pathology (C.C.), University of Verona, 37129 Verona, Italy
5. Health Physics Service (C.T.), S. Chiara Hospital, 56126 Pisa, Italy