Author Contributions: Ms Auchterlonie 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: Milliken, Auchterlonie, Hoge.
Acquisition of data: Auchterlonie.
Analysis and interpretation of data: Milliken, Auchterlonie, Hoge.
Drafting of the manuscript: Milliken, Auchterlonie, Hoge.
Critical revision of the manuscript for important intellectual content: Milliken, Hoge.
Statistical analysis: Auchterlonie.
Obtained funding: Hoge.
Administrative, technical, or material support: Hoge.
Study supervision: Milliken, Hoge.
Financial Disclosures: None reported.
Disclaimer: The views expressed in this article are those of the authors and do not reflect official policy or position of the Department of the Army, the Department of Defense, the US government, or any of the institutional affiliations listed.
Funding/Support: This research was funded by an intramural program of the US Army Medical Research and Materiel Command, Fort Dietrick, Maryland.
Role of the Sponsor: The funding organization reviewed and approved the manuscript but had no role in the design and conduct of the study; collection, management, analysis, or interpretation of the data; or preparation of the manuscript.
Additional Contribution: We thank the Army Medical Surveillance Activity for its support, and we thank Herb Goldberg, BA, T’ai Chi Ch’uan Atlanta, Atlanta, Georgia, for his outstanding editing, for which he received no compensation.