About the Authors

Monica L. Hunsberger

monica.hunsberger@gu.se

Affiliations University of Gothenburg, Public Health Epidemiology and Community Medicine, Gothenburg, Sweden, Oregon State University, Department of Public Health, Corvallis, Oregon, United States of America

Rebecca J. Donatelle

Affiliation Oregon State University, Department of Public Health, Corvallis, Oregon, United States of America

Karen Lindsay

Affiliation UCD Department of Obstetrics & Gynaecology, National Maternity Hospital, Holles Street, Dublin 2, Ireland

Kenneth D. Rosenberg

Affiliations Oregon Public Health Division, Portland, Oregon, United States of America, Department of Public Health and Preventive Medicine, Oregon Health & Science University, Portland, Oregon, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MH RJD KDR. Performed the experiments: MH. Analyzed the data: MH KL. Contributed reagents/materials/analysis tools: MH KL KDR. Wrote the paper: MH KL KDR RJD.