Vitamin A deficiency--a continuing health problem in developing countries.
D000284:Administration, Oral; D000349:Africa; D001210:Asia, Southeastern; D002648:Child; D002675:Child, Preschool; D003906:Developing Countries; D005128:Eye Diseases / Q000209:etiology; D006266:Health Education; D006306:Health Surveys; D006801:Humans; D007194:India; D013020:South America; D014801:Vitamin A / Q000008:administration & dosage / Q000627:therapeutic use; D014802:Vitamin A Deficiency / Q000453:epidemiology / Q000209:etiology
D014801:Vitamin A