Drupal-Bibcite31<style face="normal" font="default" size="100%">Incidence and prevalence of multiple sclerosis in the UK 1990-2010: a descriptive study in the General Practice Research Database</style><style face="normal" font="default" size="100%">Incidence and prevalence of multiple sclerosis in the UK 1990-2010: a descriptive study in the General Practice Research Database</style>