1. Department of Rehabilitation Medicine, University Hospital of Ioannina, Ioannina, Greece
2. Department of Neurosurgery, University Hospital of Ioannina, Ioannina, Greece
3. Department of Neurology, University Hospital of Ioannina, Ioannina, Greece
4. Department of Otolaryngology Head and Neck Surgery, University Hospital of Ioannina, Ioannina, Greece