[1] Italian Assoc Met & Biocompatibil Res, AIRMEB, I-20122 Milan, Italy
[2] Univ Milan, Audiol Unit, IRCCS Fdn Osped Maggiore Policlin Mangiagalli & R, Dept Otolaryngol, I-20122 Milan, Italy
[3] Testing S Maugeri IRCCS, Lab Environm & Toxicol, Pavia, Italy
[4] Univ Milan, IRCCS Galeazzi Hosp, Dermatol Clin, Dept Technol Hlth, I-20122 Milan, Italy