1 Division of Neurosurgery, Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia; Department of Neurology and Neurosurgery, McGill University-Montreal Neurological Hospital and Institute, Montreal, Quebec, Canada; Orthopaedic Research Laboratory, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, Montreal, Quebec, Canada. Electronic address: rfbokhari@kau.edu.sa.
2 Division of Neurosurgery, Department of Surgery, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia.
3 Division of Neurosurgery, Department of Surgery, Faculty of Medicine, University of Jeddah, Jeddah, Saudi Arabia.
4 Department of Neurology and Neurosurgery, McGill University-Montreal Neurological Hospital and Institute, Montreal, Quebec, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada.