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- 'BMJ'
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- 01/01/2011
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- SAGE Publications
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- 01/01/2004
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- SAGE Publications
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- 01/01/2004
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- Elsevier BV
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- 01/01/2011
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- SAGE Publications
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- 01/01/2005
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- B M J PUBLISHING GROUP
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- 11/05/2011
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