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References
Campbell, M. J., Donner, A., & Klar, N. (2007). Developments in cluster randomized trials and Statistics in Medicine. Statistics in Medicine, 26, 2-19.
Campbell, M. K., Mollison, J., Steen, N., Grimshaw, J. M., & Eccles, M. (2000). Analysis of cluster randomized trials in primary care: A practical approach. Family Practice, 17, 192-196.
Hayes, R. J., & Moulton, L. H. (2009). Cluster randomized trials. Boca Raton, FL: Chapman & Hall/CRC.
Hedges, L. V. (2007). Correcting a significance test for clustering. Journal of Educational and Behavioral Statistics, 32(2), 151-179.
Kerry, S. M., & Bland, J. M. (1998). Analysis of a trial randomised in clusters. BMJ, 316, 54.
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