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M. Burton
International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
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R.J. C. Bowman
International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
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H. Faal
National Eye Care Programme, Banjul, Gambia
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R.A. Adegbola
Medical Research Council Laboratories, Fajara, Gambia
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A. Foster
International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
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D.C. W. Mabey
International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
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R.L. Bailey
International Centre for Eye Health, London School of Hygiene and Tropical Medicine, London, United Kingdom