About the Authors

Renato Passini Jr

passini@caism.unicamp.br

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Jose G. Cecatti

Affiliations Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil, Centre for Studies in Reproductive Health of Campinas (CEMICAMP), Campinas, Brazil

Giuliane J. Lajos

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Ricardo P. Tedesco

Affiliations Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil, Jundiai School of Medicine, Jundiaí, Brazil

Marcelo L. Nomura

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Tabata Z. Dias

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Samira M. Haddad

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Patricia M. Rehder

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Rodolfo C. Pacagnella

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Maria L. Costa

Affiliation Department of Obstetrics and Gynaecology, School of Medical Sciences, University of Campinas, Campinas, Brazil

Maria H. Sousa

Affiliation Centre for Studies in Reproductive Health of Campinas (CEMICAMP), Campinas, Brazil

for the Brazilian Multicentre Study on Preterm Birth study group

Membership of the Brazilian Multicentre Study on Preterm Birth study group is provided in the Acknowledgments.

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RPJ JGC GJL RPT MLN TZD SMH PMR MHS. Performed the experiments: RPJ JGC GJL RPT MLN TZD SMH PMR MHS. Analyzed the data: RPJ JGC GJL RPT MLN TZD SMH PMR RCP MLC MHS. Contributed reagents/materials/analysis tools: RPJ JGC GJL RPT MLN TZD SMH MHS. Wrote the paper: RPJ JGC GJL RPT MLN TZD SMH PMR RCP MLC MHS.