Writing to authors of systematic reviews elicited further data in 17% of cases

BMJ 1998; 316 doi: https://doi.org/10.1136/bmj.316.7131.631a (Published 14 February 1998) Cite this as: BMJ 1998;316:631
  1. J McGrath, Associate professor of psychiatry,
  2. G Davies, Scientist,
  3. K Soares, Visiting associate professor
  1. Queensland Centre for Schizophrenia Research, Wolston Park Hospital, Wacol, Q4076, Australia
  2. Department of Psychiatry, Federal University of São Paulo, Brazil

    EDITOR—Roberts and Schierhout have emphasised the importance of writing letters to authors of trials in order to locate additional references for systematic reviews.1 We have recently completed nine reviews related to the treatment of tardive dyskinesia, which are available in the Cochrane Library. We identified 49 trials that had data suitable for our reviews, and a further 72 trials that still require either clarification of design issues or extraction of data on the prespecified outcomes. Altogether …

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