[1] Univ Ioannina, Fac Med, Dept Anat Histol Embryol, GR-45110 Ioannina, Greece
[2] Univ Athens, Sotiria Gen Hosp, Athens Sch Med, Dept Internal Med 3, Athens, Greece
[3] Univ Ioannina, Inst Neurosurg, Ioannina, Greece
[4] Univ Patras, Dept Environm & Nat Resources Management, Patras, Greece
[5] Univ Ioannina, Dept Neurol, Fac Med, Ioannina, Greece