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Kramer MS, Martin RM, Sterne JA, Shapiro S, Mourad D, Platt RW (2009). The double jeopardy of clustered measurement and cluster randomisation. BMJ 339:503-505.
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BMJ for allowing the James Lind Library to link to this and other BMJ articles of historical relevance (email to Iain Chalmers from Fiona Godlee, 05 May 2015).
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