Letter to the Editor: ‘Effect of education on non-specific neck and low back pain: A meta-analysis of randomized controlled trials’

To the Editor: The recent article by Ainpradub et al. (2015) includes two types of data extraction errors that can have a marked influence on the pooled results of a systematic review. We would like to alert readers to the problem and also point to some easy methods to recognise, and so avoid, such errors when conducting systematic reviews.

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