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Contributors JV and MK conceived the paper and wrote the first draft of the manuscript. All co-authors provided feedback on the first draft and substantial writing to the final version of the paper. All co-authors approved the final version.
Funding Research reported in this publication was supported by the National Cancer Institute and the Food and Drug Administration Center for Tobacco Products (CTP)(U54CA180905). The funders had no role in study design; collection, analysis, and interpretation of data; writing the report; and the decision to submit the report for publication. The content is solely the responsibility of the authors and does not necessarily represent the official views of the funders.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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