About the Authors

Gillian Santorelli

Gillian.Santorelli@bthft.nhs.uk

Affiliation Bradford Institute for Health Research, Bradford Royal Infirmary, Bradford, United Kingdom

Emily S. Petherick

Affiliation Bradford Institute for Health Research, Bradford Royal Infirmary, Bradford, United Kingdom

John Wright

Affiliation Bradford Institute for Health Research, Bradford Royal Infirmary, Bradford, United Kingdom

Brad Wilson

Affiliation iED, Bradford, United Kingdom

Haider Samiei

Affiliation iED, Bradford, United Kingdom

Noël Cameron

Affiliation School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom

William Johnson

Affiliation Unit for Lifelong Health and Ageing, Medical Research Council, London, United Kingdom

Competing Interests

Drs Wilson and Samiei are co-founders of iED, a company which specialises in creating medical apps. There are no further patents, products in development or marketed products to declare. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: GS EP JW BW HS NC WJ. Performed the experiments: GS. Analyzed the data: GS. Contributed reagents/materials/analysis tools: GS. Wrote the paper: GS WJ. Affiliation with the commercial company iED who designed the app: BW HS.