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Khan, MA; Gilbert, C; Khan, MD; Qureshi, MB; Ahmad, K; (2009) Incidence of Blinding Vitamin A Deficiency in North West Frontier Province and its Adjoining Federally Administered Tribal Areas, Pakistan. Ophthalmic epidemiology, 16 (1). pp. 2-7. ISSN 0928-6586 DOI: https://doi.org/10.1080/09286580802573185 Full text not available from this repository.

Mathenge, W; Kuper, H; Myatt, M; Foster, A; Gilbert, C; (2007) Vitamin A deficiency in a Kenyan prison. Tropical medicine & international health, 12 (2). pp. 269-273. ISSN 1360-2276 DOI: https://doi.org/10.1111/j.1365-3156.2006.01780.x Full text not available from this repository.