Before revision: Vitamin A deficiency affects one third of children under age 5 around the world,World Health Organization, Global prevalence of vitamin A deficiency in populations at risk 1995–2005, WHO world health organisation global database on vitamin A deficiency.
After revision: Vitamin A deficiency affects one third of children under age 5 around the world,World Health Organization, Global prevalence of vitamin A deficiency in populations at risk 1995–2005, WHO World Health Organization global database on vitamin A deficiency.