1. Global prevalence of vitamin A deficiency in populations at risk 1995-2005. WHO global database on vitamin A deficiency;WHO,2009
2. Pediatric ophthalmology in the developing world;Maida;Curr Opin Ophthalmol,2008
3. Effectiveness of vitamin A supplementation in the control of young child morbidity and mortality in developing countries. ACC/SCN State-of-the-art Series. Nutrition policy discussion paper no. 13;Beaton,1993
4. Effect of vitamin A supplementation on morbidity due to Plasmodium falciparum in young children in Papua New Guinea: a randomised trial;Shankar;Lancet,1999
5. Vitamin A deficiency;Rice,2004