1. Department of Otorhinolaryngology; University of Crete Medical School; Heraklion Crete Greece
2. Division of Social and Public Medicine; University of Crete Medical School; Heraklion Crete Greece
3. Department of Otolaryngology - Head and Neck Surgery; University of Erlangen; Erlangen Germany
4. Department of Endocrinology; University of Crete Medical School; Heraklion Crete Greece