About the Authors

Linda Irvine

m.a.j.irvine@dundee.ac.uk

Affiliation Centre for Biomedical Sciences and Public Health, University of Dundee, Dundee, Scotland, United Kingdom

Donald W. Falconer

Affiliation Centre for Biomedical Sciences and Public Health, University of Dundee, Dundee, Scotland, United Kingdom

Claire Jones

Affiliation School of Computing, University of Dundee, Perth Road, Dundee, Scotland, United Kingdom

Ian W. Ricketts

Affiliation School of Computing, University of Dundee, Perth Road, Dundee, Scotland, United Kingdom

Brian Williams

Affiliation The Nursing, Midwifery and Allied Health Professions Research Unit, University of Stirling, Scotland, United Kingdom

Iain K. Crombie

Affiliation Centre for Biomedical Sciences and Public Health, University of Dundee, Dundee, Scotland, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: IKC LI BW IWR. Analyzed the data: LI. Wrote the paper: LI IKC DWF CJ IWR BW. Designed the intervention text messages, recruited participants and collected data: DWF. Designed and managed the computerized system that sent and received the text messages: CJ IWR.