[1] Univ Aquila, Div Internal Med & Nephrol, Dept Life Hlth & Environm Sci, I-67100 Laquila, Italy
[2] Univ Michigan, Div Cardiovasc Med, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Sch Publ Hlth, Dept Biostat, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Dept Environm Hlth Sci, Ann Arbor, MI 48109 USA