About the Authors

Emma L. Giles

e.l.giles@ncl.ac.uk

Affiliation Institute of Health and Society, Newcastle University, Newcastle upon Tyne, Tyne and Wear, United Kingdom

Shannon Robalino

Affiliation Institute of Health and Society, Newcastle University, Newcastle upon Tyne, Tyne and Wear, United Kingdom

Elaine McColl

Affiliation Newcastle Clinical Trials Unit, Institute of Health and Society, Newcastle University, The Medical School, Framlington Place, Newcastle upon Tyne, Tyne and Wear, United Kingdom

Falko F. Sniehotta

Affiliation Institute of Health and Society, Newcastle University, Newcastle upon Tyne, Tyne and Wear, United Kingdom

Jean Adams

Affiliation Institute of Health and Society, Newcastle University, Newcastle upon Tyne, Tyne and Wear, United Kingdom

Competing Interests

Jean Adams is a PLOS ONE Editorial Board Member; this does not alter our adherence to PLOS ONE Editorial policies and criteria. No other authors have any conflicts of interest.

Author Contributions

Conceived and designed the experiments: JA FFS EM. Performed the experiments: ELG JA SR. Analyzed the data: JA ELG. Contributed reagents/materials/analysis tools: ELG JA FFS SR EM. Wrote the paper: ELG JA EM FFS SR.