[1] Univ Hosp S Orsola Mapighi, Dept Internal Med Cardioangiol & Hepatol, Bologna, Italy
[2] Nursing Home Villa Ranuzzi, Bologna, Italy
[3] Rizzoli Orthopaed Inst, Lab Immunol & Genet, Bologna, Italy
[4] Ravenna Local Hlth Unit, Lugo Hosp, Cent Lab, Ravenna, Italy
[5] Hlth Council Dept, Publ Prevent Serv, Bologna, Italy