Published Online: June 18, 2014. doi:10.1001/jamasurg.2014.97.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Goldsack.
Critical revision of the manuscript for important intellectual content: Sonnad.
Statistical analysis: Sonnad.
Administrative, technical, or material support: Goldsack.
Study supervision: Sonnad.
Conflict of Interest Disclosures: None reported.