1. Department of Otorhinolaryngology, San Raffaele Hospital and Vita-Salute University San Raffaele, Milano, Italy
2. Laboratory of Molecular Histology, San Raffaele Hospital and Vita-Salute University San Raffaele, Milano, Italy
3. Department of Otorhinolaryngology, Spedali Civili and University of Brescia, Italy
4. Department of Pathology, Spedali Civili and University of Brescia, Italy