1. Department of Eight, Skull Base, N.N. Burdenko National Medical Research Centre of Neurosurgery, Moscow, Russia
2. Department of Neurological Diseases and Neurosurgery, People's Friendship University of Russia (RUDN University), Mikluko-Maklaya St, Moscow, Russian Federation
3. Division of Anaesthesia, Sardar Women's Hospital, Ahmedabad, Gujarat, India
4. Department of Neurosurgery, Neurosurgery Clinic Birgunj, Birgunj, Nepal