Author Contributions: As principal investigator,
Dr Ascherio 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: Levin, Rubertone,
Acquisition of data: Levin, Munger, Rubertone,
Peck, Lennette, Ascherio.
Analysis and interpretation of data: Levin,
Munger, Peck, Spiegelman, Ascherio.
Drafting of the manuscript: Levin, Ascherio.
Critical revision of the manuscript for important
intellectual content: Levin, Munger, Rubertone, Peck, Lennette, Spiegelman,
Statistical analysis: Munger, Peck, Spiegelman,
Obtained funding: Levin, Lennette, Ascherio.
Administrative, technical, or material support:
Levin, Peck, Lennette, Ascherio.
Study supervision: Ascherio.
Financial Disclosures: None reported.
Funding/Support: This study was supported by
grant NS42194 from the National Institute of Neurological Disorders and Stroke.
Preliminary work was supported by a pilot grant from the National Multiple
Role of the Sponsor: The funding organizations
did not have a role in the design and conduct of the study; in the collection,
management, analysis, and interpretation of the data; or in the preparation,
review, or approval of the manuscript.
Disclaimer: The views expressed are those of
the authors and should not be construed to represent the positions of the
Department of the Army or Department of Defense.
Acknowledgment: We thank Walter Willett, MD,
DrPH, and Nancy Mueller, DSc, for their expert advice, and Eilis O’Reilly,
MSc, and Elsa Jiménez for technical assistance.