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APA Citation
Kahan, B., Forbes, G., Ali, Y., Jairath, V., Bremner, S., Harhay, M., Hooper, R., Wright, N., Eldridge, S., & Leyrat, C. (2016). increased risk of type I errors in cluster randomised trials with small or medium numbers of clusters: a review, reanalysis, and simulation study. Trials, 17(1), 1–8. http://access.bl.uk/ark:/81055/vdc_100080720065.0x0000ba