1. Department of Otorhinolaryngology-Head and Neck Surgery, Katharinenhospital; Stuttgart Germany
2. Institute for Pathology; Katharinenhospital Stuttgart Germany
3. Department of Otorhinolaryngology-Head and Neck Surgery; University of Brescia; Brescia Italy
4. Endocrinology Unit (DiMI), Department of Internal Medicine and Medical Specialties, IRCCS AOU San Martino-IST, University of Genoa; Genoa Italy
5. Department of Otorhinolaryngology-Head and Neck Surgery; University of Genoa; Genoa Italy
6. Nuclear Medicine Unit, Department of Radiology, Uni-Klinikum Tuebingen; Tuebingen Germany