4 University Department of Infectious and Tropical Diseases, University of Brescia and ASST Spedali Civili, 25123 Brescia, Italy.
5 Unit of Occupational Health and Industrial Hygiene, DSMC, University of Brescia, Brescia, Italy; Unit of Occupational Health, Hygiene, Toxicology and Prevention, ASST Spedali Civili, 25123, Brescia, Italy. Electronic address: [email protected].