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Better than what? Comparisons in low back pain clinical trials

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  • Contributors All authors substantially contributed to the conception or design of the work, analysis and interpretation of the data, drafting the work, final approval of the version published and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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