Submitted for Publication: September 13, 2013; final revision received December 18, 2013; accepted December 20, 2013.
Published Online: February 27, 2014. doi:10.1001/jamaophthalmol.2013.8142.
Study concept and design: Johnson.
Acquisition of data: Khan, Johnson.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: Fahim, Johnson.
Study supervision: Johnson.
Conflict of Interest Disclosures: None reported.