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Heydarpour, P. and Manouchehrinia, A. and Beiki, O. and Mousavi, S. E. and Abdolalizadeh, A. and Moradi ‐Lakeh, M. and Sahraian, M.A. (2018) Smoking and worsening disability in multiple sclerosis: A meta‐analysis. Acta Neurologica Scandinavica, 138 (1).