1. Department of Spinal Surgery, Petrovsky National Research Centre of Surgery, Moscow, Russian Federation
2. Department of Neurosurgery, Russian People’s Friendship University, United Nations Educational, Scientific and Cultural Organization (UNESCO), Digital Anatomy, Moscow, Russian Federation,
3. Department of Neurosurgery, Liaquat National Hospital and Medical College, Karachi, Pakistan,
4. Department of Neurosurgery, Azienda Ospedaliero Universitaria Pisana, University of Pisa, Pisa, Italy.