1. Department of Biomedical and Neuromotor Sciences; Section of Anatomic Pathology “M. Malpighi” at Bellaria Hospital, University of Bologna; Bologna Italy
2. Department of Pathology; Rizzoli Institute; Bologna Italy
3. University of Bologna, Section of Hygiene and Biostatistics; Bologna Italy
4. Department of Biomedical and Neuromotor Sciences; Section of Maxillofacial Surgery, University of Bologna, Policlinico S. Orsola; Bologna Italy
5. Department of Pathology; Villa Erbosa Hospital; Bologna Italy
6. Surgical Pathology Department; S. Orsola-Malpighi Hospital, Bologna University; Bologna Italy