Author Contributions: Dr Dominici had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Peng, Bell, Zeger, Samet, Dominici.
Acquisition of data: Bell, McDermott.
Analysis and interpretation of data: Peng, Chang, Bell, Zeger, Dominici.
Drafting of the manuscript: Peng, Chang, Bell, Samet, Dominici.
Critical revision of the manuscript for important intellectual content: Peng, Bell, McDermott, Zeger, Samet, Dominici.
Statistical analysis: Peng, Chang, Bell, McDermott, Zeger, Dominici.
Obtained funding: Peng, Bell, Zeger, Samet, Dominici.
Administrative, technical, or material support: Zeger, Dominici.
Study supervision: Zeger, Samet, Dominici.
Financial Disclosures: None reported.
Funding/Support: Funding for Drs Peng, Bell, McDermott, Zeger, Samet, and Dominici and Mr Chang was provided by grant RD-83241701 from the US Environmental Protection Agency. Funding for Drs Peng, Zeger, and Dominici also was provided by grant ES012054-03 from the National Institute for Environmental Health Sciences and by grant P30 ES 03819 from the National Institute for Environmental Health Sciences Center in Urban Environmental Health. Funding for Dr Bell was provided by grant 4720-RFA04-2/04-16 from the Health Effects Institute through the Walter A. Rosenblith New Investigator Award.
Role of the Sponsor: The funding agencies/sponsors listed above had no involvement in the design and conduct of the study; in the collection, management, analysis, or interpretation of the data; or in the preparation, review, or approval of the manuscript.
Disclaimer: Although the research described in this article has been funded wholly or in part by the US Environmental Protection Agency through grant agreement RD-83241701 to Johns Hopkins University, it has not been subjected to the agency's required peer and policy review and therefore does not necessarily reflect the views of the agency and no official endorsement should be inferred. The contents of this article do not necessarily reflect the views and policies of the Health Effects Institute.
Additional Contributions: We thank Charlotte Gerczak, MLA, for her editorial input. Ms Gerczak is a staff member of the Department of Epidemiology at the Johns Hopkins Bloomberg School of Public Health; she was not compensated for her input.