title: [Study of age-sex ratio and social structure of blood donors].
mesh_terms: D000328:Adult; D000367:Age Factors; D001782:Blood Donors; D006801:Humans; D012424:Rural Population; D012426:Russia; D012744:Sex Ratio; D012923:Social Class
vernacular_title: K voprosu ob izuchenii vozrastno-polovogo sostava i sotsial'noĭ struktury donorov krov