Submitted for Publication: April 15, 2013; final revision received July 12, 2013; accepted August 13, 2013.
Published Online: October 24, 2013. doi:10.1001/jamaoto.2013.5338.
Study concept and design: Hamilton, Samuelson, Friedman.
Acquisition of data: All authors.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: Yalamanchali, Farajian, Hamilton, Pott, Samuelson.
Critical revision of the manuscript for important intellectual content: Yalamanchali, Farajian, Hamilton, Pott, Friedman.
Statistical analysis: Yalamanchali, Farajian, Hamilton, Pott, Samuelson.
Obtained funding: Friedman.
Administrative, technical, and material support: Hamilton, Pott.
Study supervision: Friedman.
Conflict of Interest Disclosures: Dr Samuelson is a consultant for Restech and Epitopoietic Research Corporation. No other disclosures were reported.
Funding/Support: This study was funded in its entirety by the principal investigator (Dr Friedman).
Correction: This article was corrected on November 19, 2013, to remove log scales from x-axes in Figures 4 through 6.