1. Department of Surgery , General Hospital of Filiates , Thesprotia , Greece
2. Intensive Care Unit , University Hospital of Ioannina , Ioannina , Greece
3. Department of Endocrine Surgery , Henry Dunant Hospital Center , Athens , Greece
4. Department of Surgery , University Hospital of Ioannina , Ioannina , Greece
5. Medical School , University of Ioannina , Ioannina , Greece
6. Department of Anatomy-Histology-Embryology , University of Ioannina , Ioannina , Greece
7. Department of Ophthalmology , University Hospital of Ioannina , Ioannina , Greece