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2 Pugliatti M, "The worldwide prevalence of multiple sclerosis" 104 : 182-191, 2002
3 Ontaneda D, "Progressive multiple sclerosis" 28 : 237-243, 2015
4 Rice CM, "Primary progressive multiple sclerosis: progress and challenges" 84 : 1100-1106, 2013
5 Deleu D, "Prevalence, demographics and clinical characteristics of multiple sclerosis in Qatar" 19 : 816-819, 2013
6 Inshasi J, "Prevalence of multiple sclerosis in Dubai, United Arab Emirates" 121 : 393-398, 2011
7 Daif AK, "Pattern of presentation of multiple sclerosis in Saudi Arabia: analysis based on clinical and paraclinical features" 39 : 182-186, 1998
8 Akhtar N, "Newly diagnosed multiple sclerosis in state of Qatar" 115 : 1333-1337, 2013
9 Lublin FD, "New multiple sclerosis phenotypic classification" 72 (72): 1-5, 2014
10 Weinshenker BG, "Natural history of multiple sclerosis" 36 (36): S6-S11, 1994
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