1 Clinical Unit of Occupational Medicine, Department of Medical Sciences, University of Trieste, Via della Pietà 19, 34100 Trieste, Italy. Electronic address: mmauro@units.it.
2 Department of Chemical and Pharmaceutical Sciences, University of Trieste, via Giorgieri 1, 34127 Trieste, Italy.
3 Clinical Unit of Occupational Medicine, Department of Medical Sciences, University of Trieste, Via della Pietà 19, 34100 Trieste, Italy.
4 Department of Clinical and Biological Sciences, University of Torino, Via Zuretti 29, 10126 Torino, Italy.