Author Contributions: Dr Giulivi had full access to all the data in this study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Dr Hertz-Picciotto takes responsibility for the integrity of the diagnostic, sociodemographic, and comorbidity data.
Study concept and design: Giulivi, Hertz-Picciotto, Tassone, Pessah.
Acquisition of data: Giulivi, Zhang, Omanska-Klusek, Ross-Inta, Wong, Hertz-Picciotto.
Analysis and interpretation of data: Giulivi, Hertz-Picciotto, Pessah.
Drafting of the manuscript: Giulivi, Zhang, Omanska-Klusek, Ross-Inta, Wong, Tassone, Pessah.
Critical revision of the manuscript for important intellectual content: Giulivi, Hertz-Picciotto, Pessah.
Statistical analysis: Giulivi, Zhang, Omanska-Klusek, Ross-Inta, Wong.
Obtained funding: Giulivi, Hertz-Picciotto, Tassone, Pessah.
Administrative, technical or material support: Giulivi, Hertz-Picciotto, Tassone, Pessah.
Study supervision: Giulivi.
Financial Disclosures: None reported.
Funding/Support: This study received funding from the 2008 Medical Investigations of Neurodevelopmental Disorders Institute Pilot Research Grant, University of California, Davis, and support from Autism Speaks awarded to Dr Giulivi. Additional funding was provided by the MIND Institute Gift Funds FT19900 to Dr Tassone. Additional support was provided by grants P01 ES11269 and R01 ES015359 from the National Institute of Environmental Health Sciences. Additional funding was received by Dr Pessah through an Environmental Innovator Award from Autism Speaks.
Role of the Sponsors: The above-mentioned funding agencies were not responsible for the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Additional Contributions: We express our gratitude to the children and their families who participated in this study; Melissa Rose, MPH (project manager of the Childhood Autism Risk From Genes and Environment [CHARGE] study; Department of Public Health Sciences, University of California, Davis) for coordinating specimen collection from study participants; Paula Krakowiak, MS, CCRP (SAS programmer, Department of Public Health Sciences, University of California, Davis) for providing basic demographic data; and Judy Van de Water, PhD (Department of Internal Medicine, School of Medicine, University of California, Davis) for providing 6 of the samples used in this study. Those thanked for their contributions were not compensated.