About the Authors

Jim McCambridge


Affiliation Department of Public Health & Policy, Centre for Research on Drugs & Health Behaviour, London School of Hygiene & Tropical Medicine, London, United Kingdom

Kypros Kypri

Affiliation Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, Newcastle, Australia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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