Accepted for Publication: June 5, 2014.
Published Online: November 17, 2014. doi:10.1001/jamaneurol.2014.1973.
Study concept and design: Agalliu, San Luciano, Aasly, Marti-Masso, Bressman, Saunders-Pullman.
Acquisition, analysis, or interpretation of data: Agalliu, San Luciano, Mirelman, Giladi, Waro, Aasly, Inzelberg, Hassin-Baer, Friedman, Ruiz-Martinez, Orr-Urtreger, Bressman, Saunders-Pullman.
Drafting of the manuscript: Agalliu, San Luciano, Saunders-Pullman.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Agalliu, Saunders-Pullman.
Obtained funding: Agalliu, Hassin-Baer, Orr-Urtreger, Bressman, Saunders-Pullman.
Administrative, technical, or material support: San Luciano, Mirelman, Waro, Aasly, Inzelberg, Marti-Masso, Bressman, Saunders-Pullman.
Study supervision: Giladi, Friedman, Marti-Masso, Bressman, Saunders-Pullman.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by the Michael J. Fox Foundation and National Institutes of Health grant K02-NS073836 (Dr Saunders-Pullman).
Role of the Funder/Sponsor: The funding organizations 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.
Additional Contributions: Chris Coffey, PhD (College of Public Health, The University of Iowa, Iowa City), provided advice on statistical analysis methods, and Robert Ortega, MS (Mount Sinai Beth Israel Medical Center), conducted data analysis. The contributors did not receive financial compensation.