CITATION STYLE
Kramer, M. S., Martin, R. M., Sterne, J. A. C., Shapiro, S., Dahhou, M., & Platt, R. W. (2009). The double jeopardy of clustered measurement and cluster randomisation. BMJ (Online), 339(7719), 503–505. https://doi.org/10.1136/bmj.b2900
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