title: Sex education or social hygiene education in schools in forty cities.
mesh_terms: D002947:Cities; D006266:Health Education; D006801:Humans; D006920:Hygiene; D012574:Schools; D012736:Sex Education; D012749:Sexually Transmitted Diseases / Q000517:prevention & control*
keywords: SCHOOLS/health education; SEX/education; VENEREAL DISEASES/prevention and control