1. Institute of Otolaryngology, Head and Neck Surgery; Catholic University of Sacred Heart; Rome Italy
2. Institute of Anatomic Pathology; Catholic University of Sacred Heart; Rome Italy
3. Institute of Radiotherapy; Catholic University of Sacred Heart; Rome Italy
4. Laboratory of Head and Neck Center Biology, Department of Otolaryngology, Head and Neck Surgery; the University of Michigan; Ann Arbor Michigan
5. Institute of Histology; Catholic University of Sacred Heart; Rome Italy