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Newton, S; Owusu-Agyei, S; Kirkwood, B; (2007) Is there any monitoring of the quality of vitamin A capsules used in supplementation programs? The American journal of clinical nutrition, 86 (4). p. 1254. ISSN 0002-9165 https://researchonline.lshtm.ac.uk/id/eprint/8406 Full text not available from this repository.

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