Submitted for Publication: April 17, 2013; final revision received June 21, 2013; accepted July 24, 2013.
Published Online: December 19, 2013. doi:10.1001/jamaophthalmol.2013.6326.
Study concept and design: B. E. K. Klein, R. Klein.
Acquisition of data: B. E. K. Klein, Dreyer, Danforth, R. Klein.
Analysis and interpretation of data: Howard, B. E. K. Klein, Dreyer, Danforth.
Drafting of the manuscript: Howard, B. E. K. Klein, Dreyer.
Critical revision of the manuscript for important intellectual content: Howard, Danforth, R. Klein.
Statistical analysis: Howard.
Obtained funding: B. E. K. Klein, R. Klein.
Administrative, technical, and material support: B. E. K. Klein, Dreyer, Danforth, R. Klein.
Study supervision: B. E. K. Klein.
Conflict of Interest Disclosures: Dr B. E. K. Klein has served as a member of a Scientific Advisory Committee for Pfizer. No other disclosures were reported.
Funding/Support: This research was supported by grant EY06594 from the National Institutes of Health (Drs R. Klein and B. E. K. Klein), the Retina Research Foundation, and an unrestricted grant from Research to Prevent Blindness.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; collection, management, analysis, or 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 reflect the official views of the National Eye Institute or the National Institutes of Health.