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want to lose the benefits.It seems we are each unwittingly introducing a different bias by what we say.If randomised clinical trials in cancer are to be successful in recruiting patients, clinicians need more guidance on what is meant by informed consent and how to obtain it.An article by Tobias and Souhami2 and subsequent correspondence3 aired some of the issues but did not help with the practicalities.Perhaps the BMJ could commission a "How to do it" article-or is it too difficult?
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N Black (1994) studied this question.
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