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SAGE Publications, 2004
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British Medical Association, 1991
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BMJ, 1991
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British Medical Association, 1991
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BMJ, 1991
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Elsevier BV, 1987
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Elsevier BV, 1981
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JSTOR, 1975
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Physicians Postgraduate Press, Inc, 2009
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Springer Science and Business Media LLC, 2008
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Ovid Technologies (Wolters Kluwer Health), 1995
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Elsevier BV, 1983
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Elsevier BV, 1979
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Elsevier BV, 1979
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Informa UK Limited, 2021
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Wiley, 2010
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Elsevier BV, 2007
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Ovid Technologies (Wolters Kluwer Health), 2000
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Oxford University Press (OUP), 2009
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Ovid Technologies (Wolters Kluwer Health), 1994