Submitted for Publication: January 25, 2013; final revision received April 20, 2013; accepted May 9, 2013.
Published Online: October 17, 2013. doi:10.1001/jamaophthalmol.2013.5028.
Study concept and design: G. C. Cockerham, K. P. Cockerham.
Acquisition of data: G. C. Cockerham, Glynn-Milley, K. P. Cockerham.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Lemke, G. C. Cockerham, K. P. Cockerham.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Lemke.
Obtained funding: G. C. Cockerham.
Administrative, technical, or material support: Lemke, Glynn-Milley.
Study supervision: G. C. Cockerham, K. P. Cockerham.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by Merit Review Award C5018R from the Veterans Administration.
Role of the Sponsor: The funding organization had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Disclaimer: The views expressed in this article are those of the authors and do not necessarily reflect the position or policies of the Department of Veterans Affairs or the US government.
Previous Presentation: An earlier version of this article was presented at the 2009 Annual Meeting of the American Academy of Ophthalmology; October 27, 2009; San Francisco, California.
Additional Contributions: Megan Diehl, BS, contributed to patient testing and data management, and Ann Dang contributed to patient testing.