1. King Abdullah International Medical Research Center, King Saud Ben Abdulaziz University for Health Sciences, National Guard Health Affairs, P.O. Box 22490, Riyadh 11426, Saudi Arabia
2. Prince Mohammed Ben Abdulaziz Hospital, Ministry of Health, Riyadh 1176, Saudi Arabia
3. Division of Neurology, Amiri Hospital Kuwait, P.O. Box 1661, 73767 Qurtoba, Kuwait
4. Division of Neurology, Dasman Diabetes Institute, 15462 Dasman, Kuwait
5. Clinical Neurosciences Department, Salmaniya Medical Complex, 20525 Manama, Bahrain
6. Department of Neurosciences, King Faisal Specialist Hospital and Research Centre, Riyadh 11211, Saudi Arabia
7. Department of Internal Medicine, Neurology Section, Arab Medical Center and Khalidi Hospital, P.O. Box 925209, Amman 11190, Jordan
8. Department of Neurology (Medicine), Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
9. Merck Serono Intercontinental Region, Dubai 22730, UAE
10. Department of Neurology, Damascus Hospital, P.O. Box 10053, Damascus, Syria
11. MS Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran 1136746911, Iran
12. Division of Neurology, Department of Medicine, Tawam Hospital, P.O. Box 15258, Al Ain, UAE
13. Neurology Section, King Khalid University Hospital, College of Medicine, King Saud University, Riyadh 11691, Saudi Arabia
14. American University of Beirut Medical Center, Multiple Sclerosis Center, P.O. Box 11-0236, Beirut, Lebanon
15. Neurologische Klinik Bamberg, 96049 Bamberg, Germany