title: Lower socioeconomic groups and preventive public health programs: a problem of communication effectiveness.
mesh_terms: D000293:Adolescent; D001955:British Columbia; D002648:Child; D003142:Communication; D006801:Humans; D011314:Preventive Health Services; D012929:Psychological Distance; D011634:Public Health; D012923:Social Class; D012959:Socioeconomic Factors