1. Assessment and control of vitamin A deficiency: the Annecy Accords;Sommer;J Nutr,2002
2. Global prevalence of vitamin A deficiency in populations at risk 1995–2005. WHO global database on Vitamin A deficiency;World Health Organization (WHO),2009
3. National Food Consumption Survey–Fortification Baseline (NFCS-FB): South Africa, 2005,2007
4. Children aged 6 to 71 months in South Africa, 1994: their anthropometric, vitamin A, iron and immunisation coverage status;Labadarios,1995
5. Guidelines for the implementation of vitamin A supplementation;Department of Health,2004