Study concept and design: Howell, Zeitlin, Hebert, Egorova.
Acquisition, analysis, or interpretation of data: Howell, Zeitlin, Balbierz, Egorova.
Drafting of the manuscript: Howell, Zeitlin.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Zeitlin, Hebert, Egorova.
Obtained funding: Howell, Balbierz.
Administrative, technical, or material support: Balbierz.
Study supervision: Howell.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Funding/Support: This study was funded by grant R21HD068765 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development. Dr Zeitlin received funding from the European Commission, Research Directorate, Marie Curie, IOF Fellowship grant 254171.
Role of the Funders/Sponsors: The funders/sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.