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Allocation concealment and blinding: when ignorance is bliss

Harri Hemilä
Med J Aust 2005; 183 (3): 165-166.
Published online: 1 August 2005

To the Editor: In their article on controlled trials, Forder et al1 described the trial by Karlowski et al on vitamin C and the common cold2 as an example of how patients’ or investigators’ preconceptions about the value of the treatment may affect a trial’s results. However, their presentation of this trial is misleading in two respects.

  • Harri Hemilä

  • Department of Public Health, University of Helsinki, POB 41, Helsinki, FIN-00014, Finland.

Correspondence: harri.hemila@helsinki.fi

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