[1
]
a Department of Neurosurgery , University of Thessaly School of Medicine , Larissa
, Greece.
[2
]
b Vascular Surgery Department , University of Thessaly School of Medicine , Larissa
, Greece.
[3
]
c Department of Biomathematics , University of Thessaly School of Medicine , Larissa
, Greece.
[4
]
d Department of Neurosurgery , University Hospitals of Cleveland, St. Vincent's Hospital
Manhattan, Weill Cornell Medical College , OH , USA.
[5
]
e Department of Neurology , University of Thessaly School of Medicine , Larissa ,
Greece.
[6
]
f Institute for Clinical Research and Health Policy Studies, Tufts Medical Center,
Tufts University School of Medicine , Boston , MA , USA.
[7
]
g BECRO , Athens , Greece.