Submitted for Publication: September 26, 2013; final revision received December 27, 2013; accepted January 9, 2014.
Published Online: March 20, 2014. doi:10.1001/jamaoto.2014.144.
Study concept and design: Bauer, Smith.
Acquisition of data: Thorell.
Analysis and interpretation of data: Smith.
Drafting of the manuscript: Bauer, Smith.
Critical revision of the manuscript for important intellectual content: All authors.
Administrative, technical, and material support: Bauer.
Study supervision: Smith.
Conflict of Interest Disclosures: None reported.