Published Online: August 25, 2014. doi:10.1001/jamainternmed.2014.3590.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Roper.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Roper.
Administrative, technical, or material support: Roper, Zhang.
Study supervision: Korenstein.
Conflict of Interest Disclosures: None reported.
Additional Contributions: We acknowledge Jatin Roper, MD, for helpful editing of the manuscript. No financial compensation was provided for the contribution.