About the Authors

Nathalie Bajos

nathalie.bajos@inserm.fr

Affiliations Gender, Sexual and Reproductive Health, CESP Centre for research in Epidemiology and Population Health, U1018, Inserm, F-94807, Le Kremlin-Bicêtre, France, Institut National d’Etudes Démographiques, F-75020, Paris, France, Université Paris Sud, F-94807, Kremlin Bicêtre, France

Mireille Le Guen

Affiliation Gender, Sexual and Reproductive Health, CESP Centre for research in Epidemiology and Population Health, U1018, Inserm, F-94807, Le Kremlin-Bicêtre, France

Aline Bohet

Affiliation Gender, Sexual and Reproductive Health, CESP Centre for research in Epidemiology and Population Health, U1018, Inserm, F-94807, Le Kremlin-Bicêtre, France

Henri Panjo

Affiliation Gender, Sexual and Reproductive Health, CESP Centre for research in Epidemiology and Population Health, U1018, Inserm, F-94807, Le Kremlin-Bicêtre, France

Caroline Moreau

Affiliations Gender, Sexual and Reproductive Health, CESP Centre for research in Epidemiology and Population Health, U1018, Inserm, F-94807, Le Kremlin-Bicêtre, France, Institut National d’Etudes Démographiques, F-75020, Paris, France, Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland, United States of America

the FECOND group

Membership of the FECOND group is provided in the Acknowledgments.

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: MLG HP. Contributed reagents/materials/analysis tools: NB AB CM. Wrote the paper: NB CM.