The natural history of multiple sclerosis: a geographically based study. 5. The clinical features and natural history of primary progressive multiple sclerosis.
We report a natural history study of 216 patients with primary progressive (PP)- multiple sclerosis defined by at least 1 year of exacerbation-free progression at onset. This represents 19.8% of a largely population-based patient cohort having a mean longitudinal follow-up of 23 years. This subgroup...
Main Authors: | Cottrell, D, Kremenchutzky, M, Rice, G, Koopman, W, Hader, W, Baskerville, J, Ebers, G |
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Format: | Journal article |
Language: | English |
Published: |
1999
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