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7. Vitamin A deficiency in Nigeria. Rabiu MM, Kyari F. Niger J Med; 2002; 11(1):6-8. PubMed ID: 12073301 [Abstract] [Full Text] [Related]
8. Vitamin A deficiency and xerophthalmia among school-aged children in Southeastern Asia. Singh V, West KP. Eur J Clin Nutr; 2004 Oct; 58(10):1342-9. PubMed ID: 15054414 [Abstract] [Full Text] [Related]