1. Department of Otolaryngology–Head and Neck Surgery Mayo Clinic Rochester Minnesota U.S.A.
2. Department of Rheumatology University of Modena and Reggio Emilia Modena Italy
3. Department of Biomedical Experimental and Clinical Sciences “Mario Serio” University of Firenze Firenze Italy
4. Nephrology and Dialysis Unit, Meyer Children's University Hospital Firenze Italy
5. Department of Neurologic Surgery Mayo Clinic Rochester Minnesota U.S.A.
6. Department of Radiology Mayo Clinic Rochester Minnesota U.S.A.
7. Department of Otolaryngology–Head and Neck Surgery Baylor College of Medicine Houston Texas U.S.A.