1. Department of Neurology University Hospital of Larissa, School of Medicine, University of Thessaly Larissa Greece
2. Department of Cardiac Surgery Yale New Haven HospitalYale School of Medicine New Haven CT USA
3. Department of Neurosurgery University Hospital of Larissa, School of Medicine, University of Thessaly Larissa Greece
4. Department of Ophthalmology General Hospital of Trikala Trikala Greece
5. Public Health Laboratories Hellenic Pasteur Institute Athens Greece
6. Division of Vascular Surgery First Department of Surgery Laiko General HospitalNational and Kapodistrian University of Athens Athens Greece