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Previous trials of dissemination were identified
  1. P Edwards,
  2. R Cooper
  1. Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
  1. Correspondence to:
 Mr P Edwards
 LSHTM, 49–51 Bedford Square, London WC1B3DP, UK;

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Morrison et al examine the effect on questionnaire response of feeding back research findings to participants.1 As authors of the systematic review2 cited in their paper we would like to point out that we had in fact identified eight such randomised trials.3–10 The broad strategy under which these trials had been classified in …

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