1. Otolaryngology Unit, Department of Surgery, Center for Clinical and Basic Research (IRCCS), Arcispedale Santa Maria Nuova, Reggio Emilia, Italy.
2. Endocrinology Unit, Department of Surgery, Center for Clinical and Basic Research (IRCCS), Arcispedale Santa Maria Nuova, Reggio Emilia, Italy.
3. Department of Gastrointestinal and General Surgery, Mayo Clinic College of Medicine, Rochester, Minnesota.
4. Otorhinolaryngology Unit, Department of Surgery, Civilian Hospital of Urbino, Urbino, Italy.