http://researchonline.lshtm.ac.uk/12945/1/1294.full.pdf
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http://pdfs.semanticscholar.org/ae8e/73869730e9360993bd1ce347d4eb09c31ec6.pdf
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http://www.bmj.com/cgi/reprint/330/7503/1294.pdf
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http://europepmc.org/articles/PMC558199/pdf/bmj33001294.pdf
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http://publications.icr.ac.uk/2403/1/1294.pdf
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