title: Is it time to revise the classification of geographical distribution of multiple sclerosis?
authors.affiliation: Department of Neurology, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Sahraian
authors.forename: Hossein
authors.initials: H
authors.lastname: Pakdaman
authors.forename: Ali Amini
authors.initials: AA
authors.lastname: Harandi
keywords: Geographical Distribution; Multiple Sclerosis; Prevalence