1 Department of Neurological Diseases and Neurosurgery, Peoples' Friendship University of Russia, Moscow, Russian Federation.
2 Department of Neurosurgery, Yeditepe University School of Medicine, Istanbul, Turkey.
3 Department of Neurosurgery, Yeditepe University School of Medicine, Istanbul, Turkey; Department of Neurosurgery, Bakirkoy Training and Research Hospital for Neurology, Neurosurgery and Psychiatry, Istanbul, Turkey.
4 Department of Spinal Surgery, Central Clinical Hospital of the Russian Academy of Sciences, Moscow, Russia.
5 Department of Neurosurgery, Hospital Padilla de Tucuman, Tucuman, Argentina.
6 Laboratory of Microsurgical Neuroanatomy, Second Chair of Gross Anatomy, School of Medicine, University of Buenos Aires, Buenos Aires, Argentina.
7 Department of Spinal and Peripheral Nerve Surgery Burdenko Neurosurgical Center Moscow, Russia.
8 Department of Cerebrovascular and Skull Base Surgery, Instituto de Neurocirurgia Dr. Alfonso Asenjo, Providencia, Chile.
9 Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA.
10 Department of Neurosurgery, Azienda Ospedaliero Universitaria Pisana (AOUP), Pisa, Italy. Electronic address: nicola.montemurro@unipi.it.
11 Department of Neurological Surgery, University of Miami, Miami, Florida, USA.