[1] Univ Siena, Dept Mol & Dev Med, Lab Environm Hyg, Via A Moro 2, I-53100 Siena, Italy
[2] Univ Siena, Post Grad Sch Publ Hlth, Via A Moro 2, I-53100 Siena, Italy
[3] Univ Siena, Post Grad Sch Publ Hlth, Lab Environm Hyg, Dept Mol & Dev Med, Via A Moro 2, I-53100 Siena, Italy
[4] Teaching Hosp Le Scotte, Obstet & Gynecol, Str Scotte 14, I-53100 Siena, Italy