About the Authors
- Duncan Chambers
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* E-mail: duncan.chambers@york.ac.uk
Affiliation Centre for Reviews and Dissemination, University of York, York, United Kingdom
- Paul Wilson
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Affiliation Centre for Reviews and Dissemination, University of York, York, United Kingdom
- Carl Thompson
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Affiliation Department of Health Sciences, University of York, York, United Kingdom
- Melissa Harden
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Affiliation Centre for Reviews and Dissemination, University of York, York, United Kingdom
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the paper: DC PW CT MH. Wrote the protocol: DC PW MH. Performed literature searches: MH. Selected studies for inclusion: DC PW CT. Extracted data: DC PW.