1. Department of Neurosurgery, General University Hospital of Larissa, 41221 Larissa, Greece
2. Department of Pathophysiology, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece
4. Department of Neurosurgery, Nicosia General Hospital, 2029 Nicosia, Cyprus