1. Italian Association for Metals and Biocompatibility Research–A.I.R.M.E.B., Milan, Italy,
2. Department of Technology for Health, Dermatological Clinic, IRCCS Galeazzi Hospital, University of Milan, Milan, Italy
3. Claudio Minoia, Laboratory of Environmental and Toxicology Testing, “S. Maugeri”-IRCCS, Pavia, Italy