About the Authors

David Taylor-Robinson

dctr@liv.ac.uk

Affiliation Department of Public Health and Policy, University of Liverpool, Liverpool, United Kingdom

Umber Agarwal

Affiliation Liverpool Women's National Health Service Foundation Trust, Liverpool, United Kingdom

Peter J. Diggle

Affiliation School of Health & Medicine, Lancaster University, Lancaster, United Kingdom

Mary Jane Platt

Affiliation Health Policy and Practice, University of East Anglia, Norwich, United Kingdom

Bill Yoxall

Affiliation Liverpool Women's National Health Service Foundation Trust, Liverpool, United Kingdom

Zarko Alfirevic

Affiliation Department for Women's and Children's Health, University of Liverpool, Liverpool, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DT-R ZA. Performed the experiments: DT-R. Analyzed the data: DT-R MJP ZA BY PD. Contributed reagents/materials/analysis tools: DT-R UA MJP BY ZA. Wrote the paper: DT-R ZA.