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BMJ, 1976
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BMJ, 1976
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BMJ, 1975
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SAGE Publications, 1969
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SAGE Publications, 1970
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SAGE Publications, 1970
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BMJ, 1969
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BMJ, 1966
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Elsevier BV, 1963
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SAGE Publications, 1968
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Springer Science and Business Media LLC, 1985
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Portland Press Ltd., 1972
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British Medical Association, 1987
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BMJ, 1973
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BMJ, 1973
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BMJ, 1972
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BMJ, 1969
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Elsevier BV, 1967
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Springer Science and Business Media LLC, 1967
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Elsevier BV, 1967