About the Authors

Helen Christine McNamara

helenmcnamara1@gmail.com

Affiliation Monash University, Melbourne, Australia

Rachael Wood

Affiliation Information Services Division, NHS National Services Scotland, Edinburgh, United Kingdom

James Chalmers

Affiliation Information Services Division, NHS National Services Scotland, Edinburgh, United Kingdom

Neil Marlow

Affiliation Department of Neonatal Medicine, Institute for Women's Health, University College London, London, United Kingdom

John Norrie

Affiliation Centre for Healthcare Randomised Trials (CHaRT), Health Services Research Unit, University of Aberdeen, Aberdeen, United Kingdom

Graeme MacLennan

Affiliation Centre for Healthcare Randomised Trials (CHaRT), Health Services Research Unit, University of Aberdeen, Aberdeen, United Kingdom

Gladys McPherson

Affiliation Centre for Healthcare Randomised Trials (CHaRT), Health Services Research Unit, University of Aberdeen, Aberdeen, United Kingdom

Charles Boachie

Affiliation Robertson Centre for Biostatistics, University of Glasgow, Glasgow, United Kingdom

Jane Elizabeth Norman

Affiliation Tommy’s Centre for Maternal and Fetal Health, University of Edinburgh MRC Centre for Reproductive Health, The Queen’s Medical Research Institute, Edinburgh, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JEN RW JC NM JN G. McPherson G. MacLennan. Analyzed the data: G. MacLennan CB HCM. Wrote the paper: HCM. Coordinated the record linkage: JC RW. Proposed the design of the follow-up study: JEN. Made comments and contributed to subsequent drafts of the manuscript: CB JEN RW JC NM JN G. McPherson G. MacLennan.