1. Università degli Studi di Milano-Bicocca, Facoltà di Medicina e Chirurgia Sezione Anatomia Patologica Ospedale San Gerardo, Monza (Mi), Italy
2. Department of Medical Science, Dentistry and Biophysics, University of Genoa, Genoa, Italy
3. Unit of Laser Dentistry, Eastman Department of Dentistry, Rochester, New York, Italy.
4. Department of Oral Pathology, Istituto Stomatologico Italiano, Milano, Italy.