1 Department of Neurosurgery, National Center of Oncology, Milli Onkologiya Merkezi, 79B, H. Zardabi street, AZ1011, Baku, Azerbaijan.
2 Department of Orthopedic Surgery-Spine Center, University of California at San Francisco, 500 Parnassus Ave. MU320 West, San Francisco, CA 94143-0728, USA.
3 Department of Radiology, National Center of Oncology, Milli Onkologiya Merkezi, 79B, H. Zardabi street, AZ1011, Baku, Azerbaijan.