About the Authors
- Lina Chen
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Affiliation Department of Social Medicine, University of Bristol, Bristol, United Kingdom
- George Davey Smith
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Affiliation Medical Research Council Centre for Causal Analyses in Translational Epidemiology, University of Bristol, Bristol, United Kingdom
- Roger M Harbord
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Affiliation Department of Social Medicine, University of Bristol, Bristol, United Kingdom
- Sarah J Lewis
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*To whom correspondence should be addressed. E-mail: s.j.lewis@bristol.ac.uk
Affiliation Department of Social Medicine, University of Bristol, Bristol, United Kingdom
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
LC and SJL designed the study, analyzed the data, and contributed to writing the paper. GDS designed the experiments and contributed to writing the paper. RMH analyzed the data and contributed to writing the paper. Both LC and SJL had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.