Submitted for Publication: June 25, 2013; final revision received August 31, 2013; accepted September 20, 2013.
Published Online: November 14, 2013. doi:10.1001/jamaoto.2013.5650.
Study concept and design: Liu, Ahmed, Sercarz.
Acquisition of data: Liu, Bhuta, Sercarz.
Analysis and interpretation of data: Liu, Ahmed, Bhuta.
Drafting of the manuscript: Liu, Ahmed, Sercarz.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Liu, Ahmed.
Administrative, technical, or material support: Bhuta, Sercarz.
Study supervision: Ahmed, Bhuta, Sercarz.
Conflict of Interest Disclosures: None reported.