Accepted for Publication: April 25, 2013.
Published Online: July 17, 2013. doi:10.1001/jamasurg.2013.2919.
Study concept and design: Drake, Goldin, Gow.
Acquisition of data: Drake, Gow.
Analysis and interpretation of data: Drake, Horvath, Gow.
Drafting of the manuscript: Drake, Horvath, Gow.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Drake, Gow.
Administrative, technical, and material support: Drake, Gow.
Study supervision: Horvath, Goldin, Gow.
Conflict of Interest Disclosures: None reported.
Previous Presentation: This paper was presented at the 84th Annual Meeting of the Pacific Coast Surgical Association; February 17, 2013; Kauai, Hawaii, and is published after peer review and revision.
Correction: This article was corrected on July 31, 2013, to fix title of Figure 3.