title: [Comorbidity in migraine: the literature review and approaches to study].
authors.forename: V V
authors.initials: VV
authors.lastname: Osipova
authors.forename: T G
authors.initials: TG
authors.lastname: Voznesenskaia
mesh_terms: D015897:Comorbidity / Q000639:trends; D006801:Humans; D008881:Migraine Disorders / Q000453:epidemiology*; D009017:Morbidity / Q000639:trends; D012426:Russia / Q000453:epidemiology