About the Authors
- Glen E. Duncan
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*To whom correspondence should be addressed. E-mail: duncag@u.washington.edu
Affiliation Department of Epidemiology, University of Washington, Seattle, Washington, United States of America
- Jack Goldberg
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Affiliations Department of Epidemiology, University of Washington, Seattle, Washington, United States of America, Vietnam Era Twin Registry, Seattle VA Epidemiologic Research and Education Center, Seattle, Washington, United States of America
- Carolyn Noonan
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Affiliation Department of Medicine, University of Washington, University of Washington Twin Registry, Seattle, Washington, United States of America
- Anne Vernez Moudon
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Affiliations Department of Epidemiology, University of Washington, Seattle, Washington, United States of America, Department of Urban Design and Planning, University of Washington, Seattle, Washington, United States of America
- Philip Hurvitz
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Affiliation Department of Urban Design and Planning, University of Washington, Seattle, Washington, United States of America
- Dedra Buchwald
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Affiliation Department of Medicine, University of Washington, University of Washington Twin Registry, Seattle, Washington, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: GD JG. Analyzed the data: CN. Wrote the paper: GD. Other: Provided critical feedback on design and analysis: DB GD JG AM CN PH. Evaluated and revised the manuscript: JG DB AM PH CN. Established the twin registry and questionnaire: DB JG.