Submitted for Publication: November 22, 2013; final revision received January 14, 2014; accepted January 23, 2014.
Published Online: May 29, 2014. doi:10.1001/jamaoto.2014.806.
Study concept and design: Frank, Yeh.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Frank, Yeh.
Critical revision of the manuscript for important intellectual content: All authors.
Administrative, technical, or material support: Frank, Yeh.
Study supervision: All authors.
Conflict of Interest Disclosures: None reported.