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Figure 62. Prevalence of multiple sclerosis (MS) by latitude in the United States according to data from Noonan et al.140 ( × ) and Wallin et al.141 (o). The dashed line is a quadratic fit to the data from Noonan et al.,140 and the solid line is a fit to the data from Wallin et al.141 Reproduced with permission from.134
