This is an Author's Original Manuscript of an article whose final and definitive form, the Version of Record, has been published in Climate Policy 2010 copyright Taylor & Francis, available online at: http://www.tandfonline.com/10.3763/cpol.2010.0649
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Fawcett et al. (2010) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: