Published Online: August 15, 2014. doi:10.1001/jamainternmed.2014.4854.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: Cheng, Shin.
Drafting of the manuscript: Cheng.
Critical revision of the manuscript for important intellectual content: Shin, Guglielmo.
Statistical analysis: Cheng, Shin.
Administrative, technical, or material support: Guglielmo.
Study supervision: Cheng, Guglielmo.
Conflict of Interest Disclosures: Dr Cheng is employed by First Databank Inc, a commercial drug knowledge vendor. No other disclosures are reported.
Correction: This article was corrected on August 25, 2014, to revise a table entry in eTable 1 in the Supplement.