About the Authors

Ilze Bogdanovica

mcxib3@nottingham.ac.uk

Affiliations UK Centre for Tobacco Control Studies, University of Nottingham, Nottingham, United Kingdom, Division of Epidemiology and Public Health, University of Nottingham, Nottingham, United Kingdom

Ann McNeill

Affiliations UK Centre for Tobacco Control Studies, University of Nottingham, Nottingham, United Kingdom, Division of Epidemiology and Public Health, University of Nottingham, Nottingham, United Kingdom

Rachael Murray

Affiliations UK Centre for Tobacco Control Studies, University of Nottingham, Nottingham, United Kingdom, Division of Epidemiology and Public Health, University of Nottingham, Nottingham, United Kingdom

John Britton

Affiliations UK Centre for Tobacco Control Studies, University of Nottingham, Nottingham, United Kingdom, Division of Epidemiology and Public Health, University of Nottingham, Nottingham, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: IB. Wrote the paper: IB AM RM JB. Designed the study: IB AM RM JB.