Accepted for Publication: June 17, 2015.
Published Online: August 10, 2015. doi:10.1001/jamainternmed.2015.4025.
Study concept and design: Newton, Sirovich.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: Newton.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Newton, Sirovich.
Administrative, technical, or material support: Newton.
Study supervision: Sirovich.
Conflict of Interest Disclosures: None reported.
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