[1] Univ Bologna, Dept Internal Med Aging & Nephrol Dis, I-40126 Bologna, Italy
[2] Univ Bologna, Dept Cardiovasc Dis, I-40126 Bologna, Italy
[3] Univ G DAnnunzio Fdn, Clin Res Ctr, Chieti, Italy
[4] Univ G DAnnunzio Fdn, Sect Epidemiol & Publ Hlth, Chieti, Italy
[5] Univ Bern, Inst Social & Prevent Med, Div Clin Epidemiol & Biostat, Bern, Switzerland