Submitted for Publication: May 30, 2014; accepted August 9, 2014.
Published Online: October 9, 2014. doi:10.1001/jamaoto.2014.2331.
Study concept and design: Gantwerker, Hughes.
Acquisition, analysis, or interpretation of data: Gantwerker, Silvera, Vargas, Rahbar.
Drafting of the manuscript: Gantwerker, Hughes, Rahbar.
Critical revision of the manuscript for important intellectual content: Gantwerker, Hughes, Silvera, Vargas.
Statistical analysis: Rahbar.
Administrative, technical, or material support: Gantwerker, Hughes.
Study supervision: Gantwerker.
Conflict of Interest Disclosures: None reported.