1. Multiple Sclerosis Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
2. Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
3. Department of Neurology, Booalicina Hospital, Mazandaran University of Medical Sciences, Sari, Iran
4. Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
5. Department of Neurology, School of Medicine, Poursina Hospital, Guilan University of Medical Sciences, Rasht, Iran
6. Department of Neurology, School of Medicine, Arak University of Medical Sciences, Arak, Iran
7. Department of Neurology, Shahrekord University of Medical Sciences and Health Services, Shahrekord, Iran
8. Department of Neurology, Shohada Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
9. Department of Neurology, School of Medicine, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
10. Department of Neurology, Qazvin University of Medical Sciences, Qazvin, Iran
11. Neurology Research Center, Kerman University of Medical Sciences, Kerman, Iran