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  • Blackwelder, W. C. 1982. ‘Proving the null hypothesis’ in clinical trials. Control Clinical Trials,3, 345–53.

    Chow, S.-C., Shao, J., and Wang, H. 2008. Sample size calculations in clinical research, 2nd ed. New York: Chapman & Hall/CRC Press, Taylor & Francis.

    Dupont, W. D. and Plummer, W. D., Jr. 1990. Power and sample size calculations. A review and computer program. Control Clinical Trials, 11, 116–28.

    Geller, N. L. and Pocock, S. J. 1987. Interim analyses in randomized clinical trials: ramifications and guidelines for practitioners. Biometrics, 43, 213–23.

    Hayes, R. J. and Bennett, S. 1999. Simple sample size calculation for cluster-randomized trials.International Journal of Epidemiology, 28, 319–26.

    Hayes, R. J. and Moulton, L. H. 2009. Cluster randomized trials. Boca Raton: Chapman & Hall/ CRC.

    Machin, D. 2009. Sample size tables for clinical studies. Oxford: Wiley-Blackwell.
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