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Contributors ML was involved in campaign design and implementation; survey and questionnaire design; data analysis and interpretation; literature review; writing and editing of this paper. TC was involved in campaign design and implementation; overall study design and guidance; data analysis and interpretation; writing and editing of this paper. SH was involved in social media campaign implementation; survey and questionnaire design; data analysis and interpretation; review and contribution to writing and editing of this paper. PTH oversaw management of campaign as part of overall advocacy effort to draft and pass legislation; review of this paper.
Funding The campaign and surveys were supported by grants from Bloomberg Philanthropies.
Competing interests None declared.
Ethics approval Retrospective ethics approval was obtained by the Institutional Ethical Review Board of the Hanoi School of Public Health in Vietnam.
Provenance and peer review Not commissioned; externally peer reviewed.