[1] CNR, Inst Clin Physiol, CNR IFC Res Unit, Environm Epidemiol & Dis Registries, I-56124 Pisa, Italy
[2] Hlth Protect Agcy, Dept Hyg & Hlth Prevent, I-27100 Pavia, Italy
[3] Hlth Protect Agcy, Complex Operat Unit Environm Hlth & Innovat Proje, I-27100 Pavia, Italy
[4] Univ N Carolina, Water Inst, Gillings Sch Global Publ Hlth, Dept Environm Sci & Engn, Chapel Hill, NC 27516 USA