Footnotes

• Funding There was no funding support for this summary paper. The original Cochrane review was funded internally by Pain Research Funds (UK) and externally by NHS Cochrane Collaboration Programme Grant Scheme (UK) and NIHR Biomedical Research Centre Programme (UK).

• Competing interests VK has no interests to declare. RAM and HJM have consulted for various pharmaceutical companies. RAM and HJM have received lecture fees from pharmaceutical companies related to analgesics and other healthcare interventions. RAM, HJM and SD have received research support from charities, government and industry sources at various times. None had any input into this paper, nor the original Cochrane review, at any stage.

• Provenance and peer review Commissioned; externally peer reviewed.