Trials in Surgery
British Journal of Surgery 2004 January; 91(1): 6-16
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Edwards, Sarah J.L.; Braunholtz, David A.; Lilford, Richard J.; Stevens, Andrew J. (1999-05-22)In most randomised controlled trials, individual patients are randomised to a treatment or control group, but sometimes this is undesirable or even impossible and groups (clusters) of people may be randomised instead. These ...