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Contributors Both authors contributed equally.
Funding This work is supported by grant no. R01CA160695 from the US National Cancer Institute. ABG's ongoing industry monitoring work is supported by funding from Cancer Research UK, grant no. C27260/A12294 (http://www.cancerresearchuk.org) and Smokefree South West. ABG is a member of the UK Centre for Tobacco Control Studies, a UK Centre for Public Health Excellence which is supported by funding from the British Heart Foundation, Cancer Research UK, the Economic and Social Research Council, the Medical Research Council and the National Institute of Health Research, under the auspices of the UK Clinical Research Collaboration.
Provenance and peer review Not commissioned; externally peer reviewed.
Disclaimer The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Cancer Institute, the National Institutes of Health or the other funders.