About the Authors

Ann Hopton

ann.hopton@york.ac.uk

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

Kate Thomas

Affiliation Health Services Research Unit, University of Sheffield, Sheffield, South Yorkshire, United Kingdom

Hugh MacPherson

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HM KT. Performed the experiments: HM KT. Analyzed the data: AH HM. Contributed reagents/materials/analysis tools: AH. Wrote the paper: AH HM. Revised critically important intellectual content: KT.