About the Authors

Jim McCambridge

Jim.McCambridge@lshtm.ac.uk

Affiliation Faculty of Public Health & Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom

Marijn de Bruin

Affiliation Department of Communication Science, Wageningen University, Wageningen, The Netherlands

John Witton

Affiliation National Addiction Centre, King’s College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JM. Performed the experiments: JM MdB JW. Analyzed the data: JM MdB. Contributed reagents/materials/analysis tools: JM JW. Wrote the paper: JM MdB JW.