Submitted for Publication: February 21, 2013; final revision received April 22, 2013; accepted April 23, 2013.
Published Online: October 24, 2013. doi:10.1001/jamaophthalmol.2013.5059.
Study concept and design: Rulli, Floriani, Quaranta.
Acquisition of data: Biagioli, Riva, Gambirasio, De Simone.
Analysis and interpretation of data: Rulli, Biagioli, Riva, Floriani, Quaranta.
Drafting of the manuscript: Rulli, Biagioli, Riva, De Simone, Quaranta.
Critical revision of the manuscript for important intellectual content: Rulli, Biagioli, Riva, Gambirasio, Floriani, Quaranta.
Statistical analysis: Rulli, Biagioli.
Administrative, technical, or material support: Riva.
Study supervision: De Simone, Floriani, Quaranta.
Conflict of Interest Disclosures: None reported.