1. Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
2. School of Medicine, Department of Medicine, European University, Cyprus, Nicosia 2404, Cyprus
3. Department of Neurosurgery, Nicosia General Hospital, Nicosia 2029, Cyprus
4. Department of Neurosurgery, General University Hospital of Larissa, Larissa 41221, Greece
5. Department of Pathophysiology, National and Kapodistrian University of Athens, Athens 11527, Greece
6. Department of Biochemistry, Sismanogleio Hospital, Athens 15126 Greece
7. Laboratory of Clinical Virology, School of Medicine, University of Crete, Heraklion 71003, Greece