About the Authors

Barbra M. Fisher

Affiliation Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Janice Van Bockern

Affiliation Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Jan Hart

Affiliation Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Anne M. Lynch

Affiliation Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Virginia D. Winn

Affiliation Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Ronald S. Gibbs

Affiliations Department of Obstetrics and Gynecology, Section of Maternal-Fetal Medicine, University of Colorado School of Medicine, Aurora, Colorado, United States of America, Novartis Diagnostics and Therapeutics, Emeryville, California, United States of America

Adriana Weinberg

Adriana.Weinberg@ucdenver.edu

Affiliation Departments of Pediatrics, Medicine, and Pathology, University of Colorado School of Medicine, Aurora, Colorado, United States of America

Competing Interests

RG is a consultant for pharmacosurveillance (effect of H1N1 vaccine on pregnancy outcomes) for Novartis Diagnostics and Therapeutics. All other authors have declared that no competing interests exist. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BF RG VW AW. Performed the experiments: BF JV. Analyzed the data: BF JV VD RG AW. Contributed reagents/materials/analysis tools: JH AL AW. Wrote the paper: BF RG AL VW AW. Database management: JV JH AL.