About the Authors
Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
Institute for Women’s Health, University College London Hospital, London, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: LS. Analyzed the data: CM. Wrote the paper: CM. Acquisition of data: LS CM. Interpretation of data: CM LS SLT DJW OC. Critical revision of article for important intellectual content: CM LS SLT DJW OC. Final approval of the version to be published: CM LS SLT DJW OC.