About the Authors

Isabel dos Santos Silva

Contributed equally to this work with: Isabel dos Santos Silva, Bianca De Stavola

To whom correspondence should be addressed. E-mail: isabel.silva@lshtm.ac.uk

Affiliation Department of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Bianca De Stavola

Contributed equally to this work with: Isabel dos Santos Silva, Bianca De Stavola

Affiliation Department of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Valerie McCormack

Affiliation Department of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Collaborative Group on Pre-Natal Risk Factors and Subsequent Risk of Breast Cancer

Affiliation Department of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

IdSS, BDS, and VM designed the study. All members of the Collaborative Group contributed to data acquisition, with final data checking and standardisation by BDS and VM. BDS performed statistical analysis of data. IdSS, BDS, VM, and all members of the Collaborative Group interpreted the findings. IdSS and BDS had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. IdSS prepared the first draft of the manuscript. All authors provided comments in writing the paper.