About the Authors

Hugh MacPherson

hugh.macpherson@york.ac.uk

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

Liz Newbronner

Affiliations Department of Health Sciences, University of York, York, United Kingdom, Firefly Research & Evaluation, North Yorkshire, United Kingdom

Ruth Chamberlain

Affiliation Firefly Research & Evaluation, North Yorkshire, United Kingdom

Stewart J. Richmond

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

Harriet Lansdown

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

Sara Perren

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

Ann Hopton

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

Karen Spilsbury

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

Competing Interests

Liz Newbronner and Ruth Chamberlain worked for Firefly Research & Evaluation and were commissioned by the Department of Health Sciences, University of York, to conduct the interviews and work with the authors to analyse the data and prepare this manuscript. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: HM LN RC SR HL SP AH KS. Performed the experiments: LN RC. Analyzed the data: HM LN RC. Contributed reagents/materials/analysis tools: HM LN RC KS. Contributed to the writing of the manuscript: HM LN RC. Revision of the manuscript: HM LN RC SR HL SP AH KS.