1. Department of Pathology, University of Milan-Bicocca, San Gerardo Hospital, Monza, Italy.
2. Department of Biophysical Medical and Stomatological Science and Technology, University of Genoa, Genoa, Italy.
3. Faculty of Medicine, University of Genoa, Italy.
4. Department of Oral Pathology and Laser Therapy, Stomatological Institute of Milan, Milan, Italy.