title: Multiple sclerosis and age at migration.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002140:California; D002648:Child; D005843:Geography; D006801:Humans; D009103:Multiple Sclerosis / Q000453:epidemiology* / Q000209:etiology; D011157:Population Dynamics; D012306:Risk; D014861:Washington