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HARVARD Citation
Unknown (2008) Sample size calculations in clinical research. [Online]. Boca Raton : Chapman & Hall/CRC. Available from: http://access.bl.uk/ark:/81055/vdc_100046165358.0x000001
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Unknown (2008) Sample size calculations in clinical research. [Online]. Boca Raton : Chapman & Hall/CRC. Available from: http://access.bl.uk/ark:/81055/vdc_100046165358.0x000001