[1] Hosp Ferrara, Dept Internal Med, I-44124 Ferrara, Italy
[2] Univ Ferrara, Sect Internal Med Gerontol & Clin Nutr, I-44100 Ferrara, Italy
[3] Univ Ferrara, Dept Med Sci, Med Clin, I-44100 Ferrara, Italy
[4] Univ Ferrara, Vasc Surg Unit, I-44100 Ferrara, Italy
[5] Univ Salerno, Cava Tirreni & Amalfi Coast Hosp, Div Cardiol, Salerno, Italy
[6] Univ Michigan, Ctr Cardiovasc, Ann Arbor, MI 48109 USA
[7] Politecn Univ Marche, Interdept Ctr Biostat Epidemiol & Med Informat, Marche, Italy
[8] Univ Ferrara, Med Clin, Dept Med Sci, I-44100 Ferrara, Italy
[9] Univ Ferrara, Vasc Dis Ctr, I-44100 Ferrara, Italy