About the Authors

Paul Wallace

p.wallace@ucl.ac.uk

Affiliation E-health Unit, Research Department of Primary Care and Population Health, University College London, London, United Kingdom

Elizabeth Murray

Affiliation E-health Unit, Research Department of Primary Care and Population Health, University College London, London, United Kingdom

Jim McCambridge

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

Zarnie Khadjesari

Affiliation E-health Unit, Research Department of Primary Care and Population Health, University College London, London, United Kingdom

Ian R. White

Affiliation Medical Research Council Biostatistics Unit, Institute of Public Health, Cambridge, United Kingdom

Simon G. Thompson

Affiliation Medical Research Council Biostatistics Unit, Institute of Public Health, Cambridge, United Kingdom

Eleftheria Kalaitzaki

Affiliation Institute of Cancer Research, Royal Cancer Hospital, London, United Kingdom

Christine Godfrey

Affiliation Department of Health Sciences, University of York, York, United Kingdom

Stuart Linke

Affiliation Department of Psychology, Camden and Islington NHS Trust, London, United Kingdom

Competing Interests

Since June 2009, PGW has received payments from the charity Drinkaware in his capacity as its Chief Medical Advisor. PGW has no other competing interests and the authors confirm that this does not alter their adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: PGW EM JM ZK ST CG SL. Performed the experiments: ZK. Analyzed the data: IRW ST EK CG. Wrote the paper: PGW EM. Chief investigator and grant holder of the study: PGW. Wrote the paper originally submitted for review: PGW. Led on the design of the study and methodological issues: EM. Revised the paper in response to reviewer comments: EM. Contributed to the design of both the protocol and the intervention: JM. Contributed to the interpretation of the data and to the writing of the final report: JM ZK IW ST EK CG SL. Was the study research fellow and contributed to the development of the trial intervention and control websites: ZK. Was the health economist responsible for analysis and reporting of cost effectiveness: CG. Contributed to the study design and led the development of the intervention website: SL.