Accepted for Publication: February 15, 2013.
Published Online: October 23, 2013. doi:10.1001/jamasurg.2013.366.
Study concept and design: Zenoni, de la Fuente.
Acquisition of data: Zenoni, de la Fuente.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: Zenoni, de la Fuente.
Conflict of Interest Disclosures: None reported.