Search Results       Your search for [subject]Blindness prevention-el salvador returned 1 record.           Study to evaluate the efficacy of the program of mass distribution of vitamin A in El Salvador in reducing the incedence of blindness in pre-school children. by Sommer, A.; USA: Johns Hopkins Hospital. Subject: Vitamin a deficiency; Blindness prevention-el salvador; Vitamin a; Hyporitaminosis a.          Add to Book Cart Relevance: 26.25%