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http://www.bmj.com/lookup/external-ref?access_num=10.1186/1752-1947-2-197&link_type=DOI | 06:47:42 December 22, 2013

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http://dx.doi.org/10.1186/1752-1947-2-197?access_num=10.1186/1752-1947-2-197&link_type=DOI

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