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HARVARD Citation
Unknown (2010) Sample sizes for clinical trials. [Online]. Boca Raton, FL : CRC Press/Taylor & Francis. Available from: http://access.bl.uk/ark:/81055/vdc_100045387089.0x000001
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Unknown (2010) Sample sizes for clinical trials. [Online]. Boca Raton, FL : CRC Press/Taylor & Francis. Available from: http://access.bl.uk/ark:/81055/vdc_100045387089.0x000001