About the Authors

Joao Paulo Souza

souzaj@who.int

Affiliation UNDP/UNFPA/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland

Jose Guilherme Cecatti

Affiliation Department of Obstetrics and Gynecology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil

Samira M. Haddad

Affiliation Department of Obstetrics and Gynecology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil

Mary Angela Parpinelli

Affiliation Department of Obstetrics and Gynecology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil

Maria Laura Costa

Affiliation Department of Obstetrics and Gynecology, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil

Leila Katz

Affiliation Department of Obstetrics, Instituto de Medicina Integral Prof. Fernando Figueira (IMIP), Recife, Pernambuco, Brazil

Lale Say

Membership of the Neoned Study Group and LNF Study Group is provided in the Acknowledgments.

Affiliation UNDP/UNFPA/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JPS JGC. Analyzed the data: JPS. Contributed reagents/materials/analysis tools: SMH LK. Wrote the paper: JPS. Performed the experiments (statistical modeling): JPS. Provided input to the discussion: MAP MLC LS. Read and approved the manuscript: MAP MLC LS.