Mental comorbidity and multiple sclerosis: validating administrative data to support population-based surveillance
Ruth Ann Marrie*, John D Fisk, Bo Nancy Yu, Stella Leung, Lawrence Elliott, Patricia Caetano, Sharon Warren, Charity Evans, Christina Wolfson, Lawrence W Svenson, Helen Tremlett, James F Blanchard, Scott B Patten and for the CIHR Team in the Epidemiology and Impact of Comorbidity on Multiple Sclerosis