[1] Univ Bologna, Sch Hyg & Prevent Med, Dept Biomed & Neuromotor Sci, Publ Hlth & Med Stat, Via San Giacomo 12, I-40126 Bologna, Italy
[2] Univ Bologna, Unit Hyg, Dept Biomed & Neuromotor Sci, Publ Hlth & Med Stat, Via San Giacomo 12, I-40126 Bologna, Italy