1 Hematology Laboratory, Unit of Molecular Biology, University Hospital of Ioannina, Ioannina; Neurosurgical Institute, University of Ioannina, Ioannina.
2 Neurosurgical Institute, University of Ioannina, Ioannina; Department of Neurosurgery, University Hospital of Ioannina, Greece. Electronic address: alexiougrg@yahoo.gr.
3 Neurosurgical Institute, University of Ioannina, Ioannina; Department of Neurosurgery, University Hospital of Ioannina, Greece.
4 Neurosurgical Institute, University of Ioannina, Ioannina; Department of Neurology, University Hospital of Ioannina, Greece.