Andrea Gori* , Alessandra Bandera*, Giulia Marchetti*, Anna Degli Esposti*, Lidia Catozzi*, Gian Piero Nardi*, Lidia Gazzola*, Giulio Ferrario*, Jan D.A. van Embden†, Dick van Soolingen†, Mauro Moroni*, and Fabio Franzetti*
Author affiliations: *University of Milan, Milan, Italy; †National Institute of Public Health and Environmental Protection, Bilthoven, the Netherlands
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