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  1. Bob Phillips
  1. Correspondence to Dr Bob Phillips, Centre for Reviews and Dissemination, University of York, York YO10 5DD, UK; bob.phillips{at}, bob.phillips{at}

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Every now and then you will hit an evidence based medicine (EBM) question, clinical dilemma or situation where you have got it at the back of your mind, or the tip of your tongue, you have seen something similar before. It may be a network meta-analysis, where people seem to have combined studies in a spidergram not a forest plot. A …

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  • Competing interests None declared.

  • Provenance and peer review Commissioned; internally peer reviewed.

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