1. Department of Neurosurgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2. Spine Center of Excellence , Yas Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3. School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
4. Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran.
5. Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, Maryland, USA.
6. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, Maryland, USA.
7. Department of Neurology, University of California San Francisco, San Francisco, California, USA.