About the Authors

Jonathan C. Hill

Contributed equally to this work with: Jonathan C. Hill, Elaine Thomas, Susan Hill, Nadine E. Foster, Danielle A. van der Windt

j.hill@keele.ac.uk

Affiliation Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, Staffordshire, United Kingdom

Elaine Thomas

Contributed equally to this work with: Jonathan C. Hill, Elaine Thomas, Susan Hill, Nadine E. Foster, Danielle A. van der Windt

Affiliation Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, Staffordshire, United Kingdom

Susan Hill

Contributed equally to this work with: Jonathan C. Hill, Elaine Thomas, Susan Hill, Nadine E. Foster, Danielle A. van der Windt

Affiliation Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, Staffordshire, United Kingdom

Nadine E. Foster

Contributed equally to this work with: Jonathan C. Hill, Elaine Thomas, Susan Hill, Nadine E. Foster, Danielle A. van der Windt

Affiliation Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, Staffordshire, United Kingdom

Danielle A. van der Windt

Contributed equally to this work with: Jonathan C. Hill, Elaine Thomas, Susan Hill, Nadine E. Foster, Danielle A. van der Windt

Affiliation Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, Staffordshire, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JH ET SH NF DW. Performed the experiments: JH ET SH NF DW. Analyzed the data: JH ET. Contributed reagents/materials/analysis tools: JH SH. Wrote the paper: JH ET SH NF DW.