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 General Surgery, University Hospital of Larissa, Larissa 41110, Greece
4. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece