[1] Univ Catania, Dept Clin & Expt Med, Occupat Med, Via Santa Sofia,87 Edificio B Piano 0, I-95123 Catania, Italy
[2] Univ Palermo, Dept Hlth Promot Sci Maternal & Infant Care, Internal Med & Excellence Specialties, Via Vespro 129, I-90127 Palermo, Italy
[3] Prov Hlth Author Catania, Epidemiol & Prevent Unit, Via Tevere, I-95027 Catania, Italy
[4] Natl Publ Hlth Org, Directorate Res Studies & Documentat, 3-5 Agrafon St, Athens 11523, Greece