About the Authors

Ian P. Sinha

iansinha79@doctors.org.uk

Affiliation Institute of Child Health, University of Liverpool, Liverpool, United Kingdom

Paula R. Williamson

Affiliation Centre for Medical Statistics and Health Evaluation, University of Liverpool, Liverpool, United Kingdom

Rosalind L. Smyth

Affiliation Institute of Child 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: IPS PW RLS. Performed the experiments: IPS. Analyzed the data: IPS. Wrote the paper: IPS PW RLS.