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J.M. Sparrow
Bristol Eye Hospital, Bristol, United Kingdom
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E. Sanford
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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K.S. Powell
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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T.J. Peters
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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P.G. Spry
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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S. Gray
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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D. Hume
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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N.A. Frost
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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J.S. Durant
Department of Social Medicine, University of Bristol, Bristol, United Kingdom
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S.J. Frankel
Department of Social Medicine, University of Bristol, Bristol, United Kingdom