Published Online: June 10, 2015. doi:10.1001/jamasurg.2015.0962.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Weiss, Anderson.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Anderson.
Administrative, technical, or material support: Weiss, Chang.
Study supervision: Weiss, Chang.
Conflict of Interest Disclosures: None reported.
Previous Presentation: This paper was presented at the 86th Annual Meeting of the Pacific Coast Surgical Association; February 19, 2015; Monterey, California.