title: Further features of the Fennoscandian focus of multiple sclerosis.
mesh_terms: D003718:Denmark; D005387:Finland; D006801:Humans; D009103:Multiple Sclerosis / Q000453:epidemiology* / Q000401:mortality; D009664:Norway; D012042:Registries; D012537:Scandinavian and Nordic Countries; D013548:Sweden; D013557:Switzerland