About the Authors

Monica K. Silver

Affiliation Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America

Marie S. O'Neill

Affiliations Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America, Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America

MaryFran R. Sowers

† Deceased.

Affiliation Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America

Sung Kyun Park

sungkyun@umich.edu

Affiliations Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America, Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SKP. Analyzed the data: MKS SKP. Wrote the paper: MKS MSO MRS SKP.