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.
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- Harri Hemilä
- Department of Public Health, University of Helsinki, POB 41, Helsinki, FIN-00014, Finland.
Correspondence: harri.hemila@helsinki.fi
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