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UKPMC Funders Group Author Manuscript Epidemiology. Author manuscript; available in PMC 2012 April 12. Published in final edited form as: EpidemiologyJanuary ; 22(1): 68–73. doi:EDE.0b013e3181fdcd99.
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Document Date: 2012-09-29 08:50:43
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UKPMC Funders Group Author Manuscript Epidemiology. Author manuscript; available in PMC 2012 April 12. Published in final edited form as: EpidemiologyJanuary ; 22(1): 68–73. doi:EDE.0b013e3181fdcd99.