Published Online: May 8, 2014. doi:10.1001/jamaophthalmol.2014.341.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Administrative, technical, or material support: All authors.
Study supervision: Schaal.
Conflict of Interest Disclosures: None reported.
Funding/Support: The work was supported in part by an unrestricted grant from Research to Prevent Blindness, Inc.
Role of the Sponsor: The funder 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.